Part II — The Toxic World Around Us

Chapter 2

The Air We Breathe

We take approximately twenty thousand breaths a day.

We do it without thinking.

From the moment we are born until the moment we die, breathing is the most continuous interaction we have with our environment. We can choose what we eat. We can filter our water. We can stop using a particular cosmetic or cleaning product.

But we cannot choose not to breathe.

And most of the time, we have remarkably little idea what is actually in the air entering our lungs.

I didn't used to think about air this way.

Air was just air.

If I couldn't see smoke, smell something strange, or watch dust floating through a beam of sunlight, I assumed the air around me was essentially empty.

It isn't.

Every breath can contain an extraordinarily complex mixture of gases and particles originating from outdoors, the building itself, the products we use, the people around us, combustion, microorganisms, furnishings, cleaning products, fragrances, and countless other sources.

For most of us, the place where we encounter much of this mixture isn't outdoors.

It is inside.

According to the U.S. Environmental Protection Agency, Americans spend approximately 90 percent of their time indoors, where concentrations of some pollutants are often two to five times higher than typical outdoor concentrations.[1]

That fact completely changed the way I thought about environmental exposure.

We tend to picture pollution as something outside of us.

A freeway.

A factory.

A smokestack.

Wildfire smoke hanging over a city.

An airplane passing overhead.

But some of our most continuous environmental exposures can occur in the places we consider safest:

Our homes.

Our offices.

Our schools.

Our cars.

Our hotels.

The air around us may look perfectly clean while containing things we cannot see.

Just like the mine.

When Water Changes a Building

Mold became personal to me after water damage.

Before that experience, I thought about mold the way many people probably do: something unpleasant growing on old food or appearing around a shower.

I didn't understand what water could do inside a building.

A flood or leak does more than make something wet.

Water can move underneath flooring, behind baseboards, into drywall, through insulation, beneath cabinets, around door frames, and into cavities we cannot see.

And once moisture reaches materials capable of supporting microbial growth, the clock begins.

The CDC advises that homes should be cleaned and dried quickly—ideally within 24 to 48 hours after a flood—to help prevent mold growth.[2]

The problem is that the surface can look dry while moisture remains hidden.

Drywall contains paper.

Wood provides organic material.

Carpet and upholstery can retain moisture.

Insulation can remain wet.

Wallpaper, dust, ceiling tiles, and other building materials can provide places for mold to grow.

That is why a building can appear normal while something very different is happening behind its finished surfaces.

The CDC notes that mold exposure does not affect everyone identically. Some people may experience no effects, while others may develop nasal congestion, sore throat, coughing, wheezing, eye irritation, or skin reactions. People with asthma or mold allergies can have more significant reactions, and certain immunocompromised individuals are at increased risk for fungal infections.[2]

NIOSH has also found associations between damp buildings and respiratory symptoms, development or worsening of asthma, hypersensitivity pneumonitis, allergic rhinitis, eczema, and respiratory infections.[3]

That variability matters enormously.

Because one of the arguments people experiencing environmental illness often hear is:

"But nobody else in the house is sick."

That sentence sounds persuasive until you understand biology.

Exposure and response are not the same thing.

Two people can experience the same environment and respond differently.

One may have asthma.

Another may have allergies.

One may already be sensitized.

Another may not.

Their immune systems, genetics, ages, underlying health, previous exposures, and duration of exposure may all differ.

The fact that one person reacts first does not, by itself, prove what caused that reaction.

But the fact that another person does not react does not prove that the environment is harmless either.

That is the canary principle again.

Different bodies can have different thresholds.

Mold Is More Complicated Than "Toxic Mold"

The language surrounding mold can become confusing very quickly.

You will hear terms such as black mold, toxic mold, mycotoxins, mold toxicity, and mold illness used interchangeably online.

Scientifically, they are not interchangeable.

Some molds can produce substances called mycotoxins under certain conditions, but CDC cautions that toxigenic molds should not automatically be described as though the mold itself were a poison. CDC also notes that there are currently no health-based indoor-air standards establishing an acceptable quantity of mold in a building.[4]

That uncertainty sometimes gets misinterpreted.

"No established safe level" and "we have established that any detectable level causes systemic illness" are not the same statement.

Neither is scientifically justified.

What we do know is much clearer.

Persistent indoor moisture is a problem.

Visible mold growth indicates a moisture problem that needs to be corrected.

Damp buildings are associated with documented health effects.

And the response should focus on identifying and correcting the source of moisture rather than simply arguing about what species of mold is present.

NIOSH makes another important point: exposure inside a damp building can be complex. Occupants may encounter microbes, spores, fungal fragments, compounds produced by microorganisms, and chemicals released from moisture-damaged building materials.[5]

In other words, a water-damaged building isn't necessarily a story about one mold or one toxin.

It is an altered environment.

That distinction would become incredibly important to me.

VOCs: The Chemicals That Become Air

Mold isn't the only invisible component of indoor air.

Another enormous category is volatile organic compounds, or VOCs.

The word volatile refers to the ability of certain chemicals to evaporate into the air under ordinary conditions.

You don't have to open a barrel of industrial chemicals to encounter VOCs.

They can come from everyday products and materials:

Paint.

Varnish.

Adhesives.

Cleaning products.

Disinfectants.

Aerosol sprays.

Air fresheners.

Pesticides.

Solvents.

Building materials.

Furniture.

Carpet.

Printers and copiers.

Craft supplies.

Stored fuels.

Even dry-cleaned clothing.

EPA reports that concentrations of many VOCs can be substantially higher indoors than outdoors and notes that concentrations of some organic pollutants have been measured at two to five times higher indoors, with elevated concentrations sometimes persisting after a product has been used.[6]

That means a room can look spotless and still contain an invisible chemical mixture.

And "new" can sometimes be part of the problem.

A newly renovated office.

Fresh carpeting.

New furniture.

Fresh paint.

New cabinetry.

A remodeled home.

That characteristic "new" smell is not cleanliness.

It is chemistry.

Materials can release chemicals into the surrounding air through a process commonly called off-gassing.

Not every VOC is equally hazardous. That distinction is essential. VOC is a chemical category, not a synonym for poison.

Some compounds pose substantially greater health risks than others, and risk depends on factors including the particular chemical, concentration, duration, and route of exposure.

EPA reports that possible effects associated with exposure to certain VOCs can include eye, nose, and throat irritation, headaches, nausea, dizziness, and other symptoms; some organic chemicals are associated with much more serious effects at sufficient exposures.[6]

Once again, the question isn't simply:

Is there a chemical present?

The better questions are:

Which chemical? At what concentration? For how long? And who is being exposed?

The Air We Add to the Air

Then there are fragrances.

Perfume.

Cologne.

Scented candles.

Plug-in air fresheners.

Fabric softeners.

Dryer sheets.

Room sprays.

Cleaning products.

Scented hand soap.

Shampoo.

Lotions.

The smell of "clean" has become so culturally ingrained that we rarely stop to consider what creates the smell.

Fragrance isn't floating magically in the air.

A scent reaches your nose because molecules have entered the air and reached your olfactory system.

Fragranced consumer products can emit VOCs, including terpenes such as limonene. Some compounds emitted indoors can also participate in chemical reactions that produce secondary pollutants.[7]

That doesn't mean perfume is universally dangerous or that everyone who smells a fragrance is being poisoned.

But it does mean that fragrance is an airborne chemical exposure, not merely an aesthetic experience.

And some people report substantial reactions.

A U.S. population survey published in Air Quality, Atmosphere & Health found that 34.7 percent of respondents reported one or more adverse health effects associated with exposure to fragranced consumer products, including respiratory problems and migraine headaches.[7]

Survey data cannot establish that fragrance caused every symptom reported by every respondent, and self-reported reactions are different from controlled toxicological evidence.

But the findings demonstrate something important:

A meaningful portion of people report that fragranced environments affect them.

The person wearing perfume may experience nothing.

The person sharing the elevator may experience a migraine.

The employee using a scented cleaner may feel perfectly fine.

Someone entering the room afterward may begin coughing.

Again:

Different thresholds.

When the Outdoors Comes Inside

Living in the American West has made another form of air pollution increasingly difficult to ignore:

Wildfire smoke.

You can see it.

You can smell it.

Sometimes you can watch it turn the sky orange.

But what makes wildfire smoke particularly concerning isn't simply the visible haze.

Smoke contains a complex mixture of gases and particles. Among its most important components from a health perspective is fine particulate matter, often called PM2.5.

These particles are tiny—2.5 micrometers in diameter or smaller.

Because of their size, they can penetrate deep into the respiratory system. Particle pollution is associated with respiratory and cardiovascular effects, and wildfire smoke can be particularly hazardous to people with underlying heart or lung disease.[8]

The usual advice during a wildfire is simple:

Go inside.

Close the windows.

But "inside" doesn't necessarily mean "unexposed."

Outdoor smoke infiltrates buildings.

EPA reports that during wildfire events, indoor PM2.5 concentrations tend to be lower than outdoor concentrations but remain elevated compared with normal periods. How much smoke gets inside varies substantially depending on the building, ventilation, filtration, air leakage, and occupant behavior.[9]

This is why two homes on the same street can provide very different protection from the same wildfire.

The building itself becomes part of the exposure.

The Office Building Problem

For years, many of us spent eight or ten hours a day inside office buildings without ever considering the air.

We worried about ergonomics.

Lighting.

Noise.

Temperature.

Rarely did anyone ask:

What exactly are we breathing for eight hours?

An office is its own miniature ecosystem.

People.

Cleaning chemicals.

Carpet.

Furniture.

Printers.

Copiers.

Dust.

HVAC systems.

Fragrances.

Outdoor pollution entering through ventilation.

Potential water leaks.

Potential hidden moisture.

And sometimes windows that cannot even be opened.

NIOSH recognizes dampness and mold in office buildings, schools, and other nonindustrial workplaces as occupational health concerns. Water can enter through obvious sources such as a roof leak or broken pipe, but it can also remain hidden in places such as wet ceiling insulation.[5]

A systematic review of office environments likewise found that inadequate ventilation, occupancy, HVAC operation, and particulate pollution can contribute to poor indoor environmental quality.[10]

This creates an especially difficult situation for someone who reacts before coworkers do.

Imagine feeling progressively worse at work.

Headaches.

Fatigue.

Congestion.

Brain fog.

Skin reactions.

Perhaps dizziness.

Then you leave the building and begin feeling better.

You tell someone.

They look around the office.

Everyone else seems fine.

And there is the trap.

We use the majority's lack of symptoms as an environmental test.

But people are not calibrated air-quality monitors.

Neither the presence nor absence of symptoms in coworkers can tell us exactly what is in a building.

The environment has to be investigated as an environment.

Why Indoor Air Can Be Worse Than Outdoor Air

At first, the idea that indoor air can contain higher concentrations of some pollutants than outdoor air seems counterintuitive.

Buildings are supposed to protect us from pollution.

And in many circumstances, they do.

But buildings also trap things.

Imagine a sealed box.

Now put furniture inside it.

Carpet.

Paint.

Cleaning products.

A gas stove.

Candles.

Personal-care products.

Printers.

Pets.

Cooking.

Dust.

Moisture.

Twenty people.

Now reduce the rate at which indoor air is replaced or filtered.

Pollutants generated outdoors can enter the building.

Pollutants generated indoors can remain there.

EPA estimates that Americans spend roughly 90 percent of their time indoors and reports that concentrations of some pollutants are commonly two to five times higher indoors than typical outdoor concentrations.[1]

For certain VOCs, EPA reports indoor concentrations can sometimes be even higher.[6]

Indoor particulate matter can also reach or exceed outdoor concentrations depending on indoor sources and outdoor infiltration.[11]

This means our exposure is determined by more than what exists in the outside environment.

It is influenced by the interaction among:

source + concentration + ventilation + filtration + duration + individual susceptibility.

And one of those variables is particularly easy to underestimate:

duration.

We sleep in a bedroom for perhaps eight hours.

We work in an office for another eight.

We sit in cars.

We shop.

We exercise indoors.

We eat in restaurants.

We spend nearly our entire lives moving from one enclosed environment to another.

A relatively modest exposure repeated for hours, days, months, or years creates a very different biological question than a brief encounter.

The Dose Is Personal

Toxicology has long emphasized that dose matters.

But dose is not merely what exists in the environment.

It also involves how much reaches a person and for how long.

And then there is the person receiving it.

Age.

Genetics.

Asthma.

Allergies.

Cardiovascular disease.

Immune status.

Previous sensitization.

Medications.

Occupation.

Existing illness.

Previous exposures.

All of these can influence vulnerability to particular environmental hazards.

This is where the idea of the canary returns.

A sensitive individual may experience symptoms at an exposure that produces no obvious response in someone else.

That does not automatically establish that the exposure caused those symptoms.

But neither does variability make the symptoms irrelevant.

The correct response is investigation.

What is present?

Is there water damage?

Is ventilation adequate?

What products are being used?

Are pollutant concentrations elevated?

Do symptoms change when someone leaves the environment?

Are there known medical vulnerabilities?

What does the evidence support?

The question should never begin and end with:

"Is everyone else sick?"

The Air Doesn't Have to Look Dangerous

Perhaps that is the most unsettling thing I learned.

Danger doesn't always announce itself.

Carbon monoxide has no color.

Many airborne particles are microscopic.

Mold can grow behind a wall.

VOCs can evaporate from ordinary products.

Wildfire particles can infiltrate a closed home.

A building can look beautiful.

An office can look immaculate.

A hotel room can smell "fresh."

A newly remodeled house can look pristine.

And none of those observations tells us everything about the quality of the air.

That doesn't mean we should become afraid of every building, every smell, or every chemical.

Fear is not the purpose of this book.

Awareness is.

Because once I began understanding the environment around me, I realized something that seems obvious now:

We spend enormous amounts of time thinking about what we put into our bodies.

We read food labels.

We compare ingredients.

We filter water.

We take supplements.

We count calories.

We debate organic versus conventional foods.

Yet the substance we consume more continuously than almost anything else receives remarkably little attention.

Air.

We breathe it approximately twenty thousand times every day.

We cannot see most of what is in it.

We cannot necessarily smell what is dangerous.

And the person standing beside us may experience the exact same environment differently.

For most of my life, I assumed that if the air looked clean, it was clean.

If everyone else felt fine, I should feel fine.

If I reacted and they didn't, the problem must be me.

I don't believe that anymore.

I also don't believe every reaction proves an environmental toxin is responsible.

There is a more scientifically honest place between those extremes.

Listen to the signal. Then investigate the environment.

Because sometimes the first indication that something around us deserves attention isn't an alarm mounted on the wall.

Sometimes it is a person.

Sometimes it is the person whose eyes begin burning.

The person who develops the headache.

The person whose asthma worsens.

The person who cannot tolerate the room everyone else says is fine.

The person whose body reaches its threshold first.

The canary.

References

1. U.S. Environmental Protection Agency. Indoor Air Quality. EPA Report on the Environment. EPA notes that Americans spend approximately 90% of their time indoors and that concentrations of some pollutants are often two to five times higher indoors than typical outdoor concentrations. (US EPA)
EPA — Indoor Air Quality

2. Centers for Disease Control and Prevention. Mold. National Center for Environmental Health. Reviews mold growth following water intrusion, health effects associated with damp and moldy environments, and recommendations for drying water-damaged buildings. (CDC)
CDC — Mold

3. National Institute for Occupational Safety and Health. Health Problems — Mold. CDC/NIOSH. Reviews research linking damp buildings with respiratory symptoms, asthma, hypersensitivity pneumonitis, allergic rhinitis, eczema, and other conditions. (CDC)
CDC/NIOSH — Mold and Health Problems

4. Centers for Disease Control and Prevention / NIOSH. Mold, Testing, and Remediation. Discusses toxigenic molds, the absence of health-based indoor mold standards, environmental testing, and remediation. (CDC)
CDC/NIOSH — Mold Testing and Remediation

5. National Institute for Occupational Safety and Health. Mold in the Workplace. Describes the complex exposures that can occur in damp buildings, including microbes, spores and fungal fragments, microbial compounds, and VOCs released from moisture-damaged building materials. (CDC)
CDC/NIOSH — Mold in the Workplace

6. U.S. Environmental Protection Agency. Volatile Organic Compounds' Impact on Indoor Air Quality. Describes common indoor sources of VOCs, indoor concentrations, and potential health effects. (US EPA)
EPA — VOCs and Indoor Air Quality

7. Steinemann, A. Fragranced consumer products: exposures and effects from emissions. Air Quality, Atmosphere & Health (2016/2017). Reports results of a U.S. population survey concerning exposure to fragranced consumer products and self-reported health effects and discusses VOC emissions from fragranced products. (PubMed Central (PMC))
PubMed — Fragranced Consumer Products Study

8. U.S. Environmental Protection Agency. Wildfires and Indoor Air Quality. Describes wildfire smoke as a mixture of gases and fine particles and summarizes health concerns associated with fine-particle exposure. (US EPA)
EPA — Wildfires and Indoor Air Quality

9. U.S. Environmental Protection Agency. Strategies to Reduce Exposure Indoors. Reviews infiltration of wildfire PM2.5 into homes and the roles of filtration, HVAC systems, portable air cleaners, and building characteristics. (US EPA)
EPA — Reducing Wildfire Smoke Exposure Indoors

10. Licina, D., et al. A systematic review of ventilation conditions and airborne particulate matter levels in urban offices. Indoor Air (2022). Reviews ventilation, CO₂, PM2.5, and PM10 measurements in office environments and factors affecting indoor environmental quality. (PubMed)
PubMed — Office Ventilation and Particulate Matter Review

11. U.S. Environmental Protection Agency. Indoor Particulate Matter. Reviews sources and behavior of particulate matter in indoor environments and notes that indoor particle concentrations can sometimes exceed outdoor levels. (US EPA)
EPA — Indoor Particulate Matter

Chapter 3

The Water We Drink

Water is supposed to be the simplest thing we put into our bodies.

Clear.

Clean.

Essential.

We turn on a faucet and rarely think about the extraordinary journey the water has taken before reaching our glass.

It may begin in a river, reservoir, aquifer, or well. It passes through treatment facilities and miles of distribution pipes. It may travel through aging infrastructure, enter the plumbing of our homes, sit inside pipes overnight, pass through a refrigerator filter, and finally arrive in the glass we drink.

Along that journey, water can encounter substances originating from nature, industry, agriculture, infrastructure, consumer products, and even the processes used to make the water microbiologically safe.

The overwhelming majority of Americans served by regulated public water systems benefit enormously from modern drinking-water treatment. Disinfection and filtration have prevented countless cases of infectious disease.

That accomplishment shouldn't be minimized.

But safe drinking water does not mean chemically pure water.

Our water can contain minerals, disinfectants, metals, trace organic chemicals, particles, and contaminants measured in concentrations so small that we describe them in parts per billion—or even parts per trillion.

And once I started thinking about cumulative exposure, I began looking at water differently.

Because unlike an occasional exposure, we drink water every day.

We cook with it.

We make coffee with it.

We wash produce with it.

We shower in it.

We breathe some of the compounds released from it into the air.

And we do this for decades.

The question isn't whether we should fear our water.

It is whether we should understand it.

The Chemicals Designed to Last Forever

Few contaminants illustrate the challenge of modern environmental exposure better than PFAS.

PFAS stands for per- and polyfluoroalkyl substances, a large family of synthetic chemicals that have been used in industrial applications and consumer products for decades.

Their chemistry made them extraordinarily useful.

They can resist heat.

Oil.

Grease.

Water.

Stains.

That durability helped PFAS find their way into applications ranging from firefighting foams and industrial processes to certain stain-resistant, water-resistant, and grease-resistant products.

But the characteristic that made many PFAS compounds commercially valuable created another problem.

They persist.

Some PFAS break down extremely slowly in the environment, which is why they are often called "forever chemicals."

They have been detected in water, soil, wildlife, and people.

And they can enter drinking-water supplies.

PFAS contamination has been particularly associated with areas near certain industrial facilities, military installations, airports, and locations where PFAS-containing firefighting foams were historically used.

For someone like me, who had already begun thinking about aviation-related environmental exposures, that connection caught my attention.

But PFAS is not simply an airport issue.

It is a national drinking-water issue.

The EPA established the first federal drinking-water standards for several PFAS in 2024, including enforceable limits of 4 parts per trillion for PFOA and PFOS.

Parts per trillion.

That scale is difficult to comprehend.

One part per trillion is roughly equivalent to one second in about 31,700 years.

When regulators are discussing chemicals at concentrations that small, it demonstrates how dramatically analytical science has evolved.

We can now detect substances that previous generations could not even measure.

The science and regulation of PFAS are also evolving. As of 2026, EPA has proposed maintaining the PFOA and PFOS limits while modifying implementation timelines and reconsidering federal standards for several other PFAS.

That evolving regulatory landscape is important because environmental science does not stand still.

What we consider acceptable today can change as evidence accumulates.

Heavy Metals: An Older Threat

Not every drinking-water concern comes from modern chemistry.

Some come from elements that have existed since the formation of the Earth.

Lead.

Arsenic.

Cadmium.

Chromium.

Other metals and metalloids can also become concerns depending on the water source, geology, treatment system, and plumbing.

The phrase heavy metals is often used broadly, sometimes imprecisely, but several metallic and metalloid contaminants are well-established drinking-water hazards at sufficient exposure levels.

Lead is perhaps the most familiar.

One of the unsettling things about lead in drinking water is that it does not necessarily originate at the treatment plant.

It can enter water after treatment, through service lines, solder, fixtures, faucets, and plumbing materials.

That means the water leaving a municipal treatment facility and the water emerging from a particular home's faucet are not necessarily chemically identical.

And there is no reliable way to determine the amount of lead in water by looking at it.

You cannot see it.

You cannot smell it.

You cannot taste it.

The CDC emphasizes that no safe blood lead level in children has been identified.

It also advises that boiling water does not remove lead. In fact, boiling can concentrate contaminants that do not evaporate with the water.

Arsenic presents a different problem.

It can occur naturally in groundwater as water interacts with rock and soil. In some regions, geology itself becomes the source of exposure.

This is an important reminder.

"Toxic" does not necessarily mean synthetic.

Nature produces plenty of substances capable of harming us.

The biological question is not whether something is natural or manufactured.

It is:

What is it?

How much are we exposed to?

For how long?

The Trade-Off That Saved Millions of Lives

Then there is chlorine.

Chlorinating drinking water was one of the great public-health advances of the twentieth century.

Before widespread water disinfection, diseases transmitted through contaminated drinking water—including typhoid and cholera—could devastate communities.

Disinfection changed that.

Today, treatment facilities commonly use chlorine, chloramine, chlorine dioxide, ozone, ultraviolet light, or combinations of treatment methods to control pathogens.

The benefit is enormous.

But chemistry involves trade-offs.

When disinfectants such as chlorine react with naturally occurring organic material in source water, they can create new chemicals known as disinfection byproducts, or DBPs.

Two major regulated groups include:

Trihalomethanes (THMs) and haloacetic acids (HAAs).

This is a perfect example of why environmental-health conversations require nuance.

Chlorine is not simply "bad."

Removing disinfectants from municipal water without an appropriate alternative could create a far more immediate danger from infectious organisms.

The challenge is balancing two risks:

Destroy dangerous pathogens while minimizing potentially harmful chemical byproducts.

EPA regulates several disinfection byproducts because long-term exposure above established levels is associated with health concerns.

The goal isn't zero chemistry.

Water is chemistry.

The goal is managing chemistry intelligently.

Pharmaceuticals in the Water Cycle

Then I learned something that initially sounded almost impossible.

Researchers can detect traces of pharmaceuticals in environmental water.

Medications we consume do not simply disappear.

Our bodies metabolize some portion of them, while other portions or metabolites can be excreted. Unused medications may also be improperly discarded. These compounds can enter wastewater systems, where conventional treatment processes were not necessarily designed to eliminate every pharmaceutical molecule.

Wastewater ultimately returns to the environment.

Water moves.

Rivers become drinking-water sources.

Groundwater moves through aquifers.

Treated wastewater can be discharged, reused, or eventually become part of another water supply.

EPA recognizes pharmaceuticals among contaminants of emerging concern in water research.

This does not mean that drinking a glass of tap water is equivalent to taking medication.

The concentrations detected are generally extremely small, and the existence of a detectable chemical does not automatically establish a meaningful health risk.

That distinction matters throughout this book:

Detection is not the same thing as toxicity.

Modern instruments can identify chemicals at extraordinarily low concentrations.

Finding something tells us it is there.

It does not, by itself, tell us whether the concentration is harmful.

But the discovery raises another question that increasingly defines environmental science:

What happens when we are exposed not to one substance, but to tiny concentrations of many substances repeatedly over a lifetime?

For many emerging contaminants, we simply don't have complete answers yet.

Plastic Has Become Part of the Water Cycle

Then there are microplastics.

Plastic doesn't simply disappear when it enters the environment.

It fragments.

Large pieces become smaller pieces.

Smaller pieces become microscopic particles.

Microplastics are generally described as plastic particles smaller than five millimeters, while still smaller particles are often referred to as nanoplastics.

Researchers have detected microplastics in environmental water and drinking water—including both tap and bottled water.

A systematic review of drinking-water studies confirmed microplastic contamination across the studies that met its quality criteria, although the reported concentrations varied enormously depending on sampling and analytical methods.

That last part is important.

Microplastic science is still developing.

Different researchers have used different definitions, collection methods, particle-size thresholds, and analytical techniques. Smaller particles are particularly difficult to measure reliably.

More recent reviews continue to identify microplastics in drinking-water systems while emphasizing the need for standardized testing and much better information about human exposure and health consequences.

We know humans are exposed.

What we do not yet know with sufficient certainty is exactly what lifelong exposure to different sizes, shapes, polymers, additives, and concentrations means for human health.

This is another place where I resist both extremes.

It is premature to claim that the microplastics in someone's drinking water explain a particular chronic illness.

But it would be equally unreasonable to declare the subject irrelevant simply because every biological consequence has not yet been established.

The appropriate response is research.

Again:

The signal should create curiosity.

Bottled Doesn't Automatically Mean Better

Like many people, I once assumed that if I became concerned about tap water, bottled water was the obvious solution.

But bottled water introduces its own questions.

Where did the water originate?

How was it treated?

How long has it been stored?

At what temperature?

What is the bottle made from?

Research has detected microplastics in both tap and bottled water, and some studies have reported higher particle counts in bottled samples.

That doesn't mean every bottled water contains more microplastics than every municipal water supply.

It means the assumption that bottled automatically equals purer isn't scientifically justified.

The container itself becomes part of the system.

Again, there is no perfect bubble.

There are simply choices, trade-offs, and ways to reduce particular exposures.

When I Finally Tested My Own Water

Eventually, reading about drinking water wasn't enough for me.

I wanted to know what was in my water.

So I tested it.

That distinction matters.

A municipal water-quality report can provide valuable information about the larger water system. But it cannot necessarily tell you everything about the water coming from a particular faucet after traveling through neighborhood infrastructure and the plumbing inside a specific home.

That is where my Oasis water testing became important.

The report gave me something I had been seeking throughout my health journey:

data.

Not fear.

Not speculation.

Not something I had read online.

Measurements from the environment in which I was actually living.

[INSERT OASIS RESULTS HERE: identify the specific contaminants tested, the concentrations detected, applicable regulatory or laboratory reference levels, and which results were below detection limits. Distinguish clearly between a contaminant being detected and a contaminant exceeding a health-based or regulatory benchmark.]

The results changed the conversation for me.

Instead of asking:

"What might be in my water?"

I could begin asking:

"What is actually in my water, at what concentration, and what can I reasonably do about it?"

That is an extraordinarily empowering shift.

Environmental awareness becomes much less frightening when it becomes measurable.

Test Before You Treat

This is one of the most practical lessons I have learned.

If you are concerned about water, don't begin by buying the most expensive filtration system someone on the internet recommends.

Begin by understanding the problem you are trying to solve.

Municipal customers can start with their water provider's Consumer Confidence Report, which summarizes regulated drinking-water testing.

But depending on the concern, household testing can provide additional information.

Testing may be particularly worth considering if you have:

An older home.

Potential lead plumbing.

A private well.

Known contamination in your region.

Unusual taste, odor, or staining.

A nearby industrial or military site.

Specific reason to suspect PFAS or another contaminant.

Or simply a desire to understand your household water more precisely.

Testing is also important because no single filtration technology removes everything.

A filter designed to improve chlorine taste may not be certified to remove lead.

A sediment filter is not a PFAS treatment system.

A filter that removes microorganisms may not remove dissolved chemicals.

The word filter tells you surprisingly little.

You need to know what it is certified to remove.

Filtration: Match the Tool to the Problem

Once you know what you are trying to reduce, filtration becomes much easier to understand.

Activated Carbon

Activated carbon is widely used in pitchers, refrigerator filters, faucet filters, and whole-house systems.

Carbon can be useful for reducing chlorine, taste, odor, and certain organic chemicals. Depending on the specific design and certification, some carbon filters can also reduce lead, certain PFAS, and other contaminants.

But not every carbon filter does all of those things.

Certification matters.

Reverse Osmosis

Reverse osmosis, or RO, pushes water through a membrane capable of removing a broad range of contaminants.

CDC notes that reverse-osmosis systems can remove microorganisms and certain chemicals, including lead, copper, chromium, chloride, and sodium, and may reduce arsenic, fluoride, radium, nitrate, and other substances.

RO can be an excellent option when the contaminants you are concerned about are appropriately addressed by the specific system.

But it has trade-offs.

Systems require maintenance.

Filters and membranes need replacement.

RO systems can waste some water during treatment.

They can remove minerals along with unwanted contaminants.

And not every system is certified for every contaminant.

Whole-House Versus Drinking-Water Filtration

Another question is where to filter.

A point-of-use system treats water at a particular location—usually the kitchen sink.

A point-of-entry system treats water as it enters the house.

If the primary concern is what you drink and cook with, point-of-use filtration may be sufficient.

If the concern involves contaminants that can become airborne during showering or that you want reduced throughout the house, the calculation may be different.

Again, there isn't one correct filtration system for everyone.

The right system depends on the water.

Look Beyond the Marketing

One of the easiest mistakes to make is buying a filter because the packaging says:

"Removes contaminants."

Which contaminants?

At what percentage?

For how many gallons?

Under what conditions?

Tested by whom?

CDC recommends looking for independent certification and specifically identifying the contaminants a filter is certified to reduce.

NSF/ANSI standards provide one useful framework.

For example:

NSF/ANSI 42 generally addresses aesthetic effects such as chlorine taste and odor.

NSF/ANSI 53 addresses certain contaminants with health effects and can include claims such as lead reduction.

NSF/ANSI 58 applies to reverse-osmosis systems.

But even a certification number isn't enough by itself.

You still need to examine the specific contaminant-reduction claims for that particular product.

Buying a water filter should be more like buying medical equipment than buying a decorative appliance.

Know what problem you are solving.

Verify that the device is designed and independently certified to address it.

Maintain it correctly.

Replace cartridges when required.

And, when appropriate, test the treated water to confirm that the system is doing what you expect.

The Dose We Take Every Day

Water helped me understand cumulative exposure in a way few other things could.

Suppose a person drinks two liters of water every day.

That's approximately 730 liters a year.

Over fifty years, that becomes roughly 36,500 liters.

And that doesn't include water used in coffee, tea, cooking, ice, or other beverages.

This doesn't mean a trace contaminant automatically becomes dangerous simply because exposure continues for decades.

Toxicology doesn't work that way.

The substance matters.

The dose matters.

The body's absorption and elimination matter.

But duration matters too.

When scientists establish drinking-water standards for chronic contaminants, they often consider the reality that people may consume that water repeatedly over many years.

This is why the concept of cumulative burden kept returning for me.

Not because every molecule accumulates permanently in the body.

Many do not.

Some are metabolized rapidly.

Some are eliminated.

Others, including certain PFAS and metals, can persist in the human body much longer.

"Cumulative toxic burden" should therefore not be treated as though it were one measurable substance sitting inside us.

It is a framework for thinking about repeated exposures interacting with individual biology over time.

And water may be one of our most consistent exposure pathways.

From Fear to Agency

Learning about PFAS, metals, disinfection byproducts, pharmaceuticals, and microplastics could easily make someone afraid to drink anything.

That is not the lesson I took from it.

The lesson was agency.

We know more about our environment than any generation before us.

We can detect chemicals at concentrations that would once have been invisible.

We can obtain municipal water reports.

We can test our homes.

We can identify specific contaminants.

We can choose filtration technologies designed to reduce particular exposures.

And we can advocate for cleaner water upstream rather than placing the entire responsibility on individual households.

The goal isn't purity.

There may be no such thing as perfectly pure water outside a laboratory—and even laboratory purity serves a very different purpose from healthy drinking water.

The goal is understanding and reasonable reduction of risk.

For me, that distinction has become essential.

I don't want to live afraid of my environment.

I want to understand it.

Because the canary metaphor was never really about fear.

The miners didn't stop breathing because dangerous gases existed.

They learned how to detect them.

They monitored their environment.

They improved ventilation.

Eventually, they developed better technology.

Awareness led to action.

Our drinking water deserves the same approach.

Ask what's in it.

Measure what you can.

Understand what the numbers mean.

Reduce exposures when there is a reasonable basis for doing so.

And never confuse the fact that something is invisible with proof that it isn't there.

Sometimes the most important things in our environment are measured not in what we can see—

but in parts per million.

Parts per billion.

And now, sometimes, parts per trillion.

References

1. U.S. Environmental Protection Agency. Per- and Polyfluoroalkyl Substances (PFAS): Final PFAS National Primary Drinking Water Regulation. EPA established federal drinking-water limits for several PFAS, including 4.0 ppt MCLs for PFOA and PFOS. EPA's PFAS regulatory framework continues to evolve; in May 2026, EPA proposed retaining the PFOA/PFOS limits while extending the compliance timeline and proposed rescinding federal limits for several other PFAS.
EPA — PFAS in Drinking Water

2. U.S. Environmental Protection Agency. Proposed PFOA and PFOS Compliance Extension Rule. Describes EPA's May 2026 proposal to retain PFOA and PFOS drinking-water limits while potentially extending compliance to 2031.
EPA — 2026 PFAS Compliance Proposal

3. Centers for Disease Control and Prevention. About Lead in Drinking Water. Reviews lead exposure from drinking water and steps consumers can take to reduce exposure, including independently certified point-of-use filtration. CDC notes that boiling does not remove lead.
CDC — Lead in Drinking Water

4. U.S. Environmental Protection Agency. National Primary Drinking Water Regulations. Federal standards and health information for regulated drinking-water contaminants, including arsenic, lead, disinfection byproducts, and PFAS.
EPA — National Drinking Water Regulations

5. U.S. Environmental Protection Agency. Drinking Water Distribution System Tools and Resources. Describes drinking-water disinfection and explains how disinfectants can react with naturally occurring organic matter to form disinfection byproducts.
EPA — Disinfectants and Disinfection Byproducts

6. Centers for Disease Control and Prevention. How Water Treatment Works. Reviews coagulation, filtration, and disinfection processes and the use of chlorine, chloramine, chlorine dioxide, ozone, and ultraviolet treatment.
CDC — How Water Treatment Works

7. U.S. Environmental Protection Agency. Treatment and Control of Drinking Water Contaminants Research. EPA research includes PFAS, metals, disinfection byproducts, pharmaceuticals, and other emerging contaminants in drinking water.
EPA — Drinking Water Contaminant Research

8. Danopoulos, E., Twiddy, M., & Rotchell, J. M. Microplastic contamination of drinking water: A systematic review.PLOS ONE (2020). The review found microplastics in both tap and bottled-water studies while identifying substantial variation in analytical methods and reported concentrations.
PubMed — Microplastics in Drinking Water Systematic Review

9. Yang, L., et al. Microplastics in drinking water: A review on methods, occurrence, sources, and potential risks assessment. Environmental Pollution (2024). Reviews widespread detection of microplastics in drinking water and significant methodological and research gaps.
PubMed — 2024 Microplastics Review

10. Centers for Disease Control and Prevention. About Choosing Home Water Filters. Explains that different filtration technologies remove different contaminants and recommends checking independent certifications and specific contaminant-reduction claims.
CDC — Choosing a Home Water Filter

11. Centers for Disease Control and Prevention. About Home Water Treatment Systems. Reviews activated filtration, ultrafiltration, nanofiltration, reverse osmosis, and distillation, including the contaminants different technologies may reduce or remove.
CDC — Home Water Treatment Systems

12. U.S. Environmental Protection Agency. Treatment and Control of Drinking Water Contaminants Research. EPA identifies pharmaceuticals among human-made chemical contaminants being studied in water and drinking-water treatment research.
EPA — Emerging Drinking Water Contaminants

Chapter 4

The Products We Trust

Most of us assume that if a product is sitting on a store shelf, someone has made sure it is safe.

The shampoo.

The moisturizer.

The cleaning spray.

The plastic container.

The nonstick wrapper.

The couch.

The pesticide.

The candle.

We assume there is a system standing between us and harm.

And there is.

But that system is more complicated than most consumers realize.

Different products are regulated under different laws by different agencies. Some ingredients receive extensive scrutiny. Others enter commerce under broader safety obligations placed on manufacturers. Some substances are restricted only for particular uses. Some products can contain chemicals that are legal and useful but still capable of causing irritation, sensitization, toxicity, or other effects depending on the substance, dose, exposure route, and person.

That does not mean the products around us are inherently dangerous.

It means that the word safe is rarely as simple as we think it is.

Safe for whom?

At what dose?

Under what conditions?

Used how often?

Combined with what other exposures?

Those questions became more important to me as I began looking at the products I had trusted all my life.

Because once I started thinking about cumulative exposure, I realized something uncomfortable:

We don't encounter most consumer products one at a time.

We encounter them all day long.

The Bathroom Cabinet

Start with the morning.

Shampoo.

Conditioner.

Body wash.

Face cleanser.

Moisturizer.

Deodorant.

Makeup.

Sunscreen.

Hair products.

Perfume.

Toothpaste.

Maybe nail products.

Maybe shaving cream.

Maybe several serums, creams, powders, and sprays.

FDA notes that people use an average of roughly six to twelve cosmetic products every day.[1]

One product may contain a handful of ingredients.

Another may contain dozens.

Most people are not chemists, toxicologists, or regulatory scientists. We are standing in a store aisle trying to decide which bottle looks trustworthy.

So we rely on words.

"Clean."

"Natural."

"Botanical."

"Pure."

"Non-toxic."

"Hypoallergenic."

Those words can feel reassuring.

But they don't necessarily mean what consumers think they mean.

FDA explicitly cautions that the source of an ingredient does not determine its safety and that consumers should not assume products described as natural or organic are inherently safer.[2]

FDA also does not define the term hypoallergenic for cosmetics.[2]

That surprised me.

I had spent years assuming labels functioned almost like medical assurances.

They don't always.

A label can tell us something.

But marketing language and toxicological evidence are not the same thing.

Cosmetics Are Chemistry Too

The word chemical has become almost synonymous with danger in wellness culture.

But everything around us is made of chemicals.

Water is a chemical.

Oxygen is a chemical.

Vitamin C is a chemical.

Lavender contains chemicals.

A lemon contains hundreds of chemical compounds.

The useful distinction is not:

chemical versus chemical-free.

There is no chemical-free shampoo.

The meaningful questions are about the characteristics of the chemicals involved.

Are they irritating?

Sensitizing?

Persistent?

Bioaccumulative?

Carcinogenic?

Endocrine-active?

At what dose?

Through what route?

How frequently?

That is a much more difficult conversation than simply dividing a store shelf into "toxic" and "clean."

And yet it is much closer to how toxicology actually works.

Cosmetics in the United States are regulated by FDA. The Modernization of Cosmetics Regulation Act of 2022, or MoCRA, represented the most significant expansion of FDA's cosmetic authority since 1938 and added new requirements including facility registration, product listing, safety substantiation, adverse-event reporting, and certain manufacturing requirements.[1]

But consumers may be surprised to learn that most cosmetic products and ingredients—other than color additives—do not require FDA premarket approval before appearing on store shelves.[2]

The legal responsibility is primarily on companies to ensure that their products are safe under labeled or customary conditions of use.

That is not the same thing as saying cosmetics are unregulated.

They are regulated.

But the system is different from the one used for prescription drugs.

Understanding that distinction made me a much more careful consumer.

The Fragrance Problem Returns

Fragrance appears again here because it sits at the intersection of cosmetics, indoor air, cleaning products, and personal exposure.

FDA requires cosmetic ingredients to appear on labels, but fragrance mixtures generally can be listed simply as "fragrance" rather than having each fragrance ingredient individually disclosed to consumers.[3]

That doesn't mean those ingredients are automatically harmful.

But it does mean someone who is sensitive to a particular fragrance ingredient may have difficulty knowing exactly what is in a product.

For most people, a scented lotion may be nothing more than pleasant.

For someone else, it can become a skin reaction.

Or a headache.

Or respiratory irritation.

The same product can be experienced very differently by different bodies.

And that pattern kept appearing throughout my own health story.

It wasn't simply that I had become afraid of products.

I had become aware that my threshold might not be someone else's threshold.

Cleaning Our Homes With Chemistry

The irony of cleaning products is almost impossible to miss.

We use them to make our environments healthier.

And often they do.

Cleaning removes dirt, allergens, microbes, and contaminants. Disinfectants can be enormously important when we actually need to kill pathogens.

But cleaning products can also introduce chemicals into indoor air.

EPA identifies cleaning and disinfecting products among common sources of volatile organic compounds, or VOCs.[4]

That "freshly cleaned" smell may represent chemicals evaporating into the air.

Again, smell does not equal toxicity.

But scent is not proof of cleanliness either.

The modern idea that a clean home should smell strongly of lemon, pine, flowers, or perfume is largely cultural.

Clean does not actually have a smell.

And sometimes our desire to sterilize everything encourages us to use stronger products more often than necessary.

One of the most important practical lessons is remarkably simple:

Cleaning and disinfecting are not the same thing.

Cleaning physically removes dirt and many germs from surfaces.

Disinfecting uses chemicals designed to kill microorganisms.

There are times when disinfection is appropriate.

But not every countertop needs aggressive chemical disinfection every hour of the day.

And more is not always better.

EPA warns never to mix cleaning products unless the label specifically permits it. Mixing bleach with incompatible products, for example, can generate toxic gases.[5]

Ventilation matters too.

If a product releases VOCs, using it inside a closed bathroom or poorly ventilated room creates a different exposure than using the same amount with good ventilation.

Again:

Product + dose + environment + duration + person.

That equation keeps returning.

"Low VOC" Doesn't Always Mean Low Risk

Another label that sounds reassuring is:

Low VOC.

Or:

Zero VOC.

But EPA warns that these descriptions can be misleading if we assume they mean a product has no potentially hazardous volatile chemicals.

Some chemicals that are toxic may not fall within regulatory VOC definitions used for controlling outdoor ozone formation. EPA also cautions that reducing total VOCs does not automatically guarantee that a product is safer because individual volatile chemicals differ greatly in toxicity.[6]

That is an important lesson far beyond cleaning products.

A simple number can obscure the identity of what is actually being measured.

Ten chemicals are not necessarily more dangerous than two.

A higher total concentration is not necessarily more harmful than a lower concentration if the chemicals have different toxicological properties.

The details matter.

Plastic: The Material That Changed Everything

Few inventions have transformed modern life as profoundly as plastic.

Plastic made medical equipment lighter and safer.

It protected food from contamination.

It reduced breakage.

It made transportation cheaper.

It enabled sterile packaging.

It revolutionized electronics, construction, medicine, manufacturing, and countless other industries.

Plastic is not one material.

It is an enormous category of polymers combined with different additives to produce different properties.

Flexible.

Rigid.

Clear.

Heat resistant.

Soft.

Flame resistant.

Waterproof.

Each characteristic can require different chemistry.

And that chemistry has consequences.

Some chemicals used in plastics are not permanently locked inside the material. Certain additives can migrate out over time depending on the substance and conditions of use.

Researchers have paid particular attention to chemicals such as bisphenols and phthalates because some members of these chemical families can interact with hormone signaling.[7]

That does not mean every plastic contains BPA.

It does not mean every phthalate has identical effects.

And it certainly does not mean touching a plastic container is inherently dangerous.

But it does mean the package is not always biologically irrelevant.

Food Doesn't Stop at the Package

Food packaging once seemed completely separate from nutrition to me.

I looked at the ingredients inside the package.

I rarely thought about the package itself.

But food and packaging interact.

Chemicals used in plastics, coatings, adhesives, inks, grease-resistant materials, and other food-contact applications can sometimes migrate into food.

The amount that migrates depends on many variables:

Temperature.

Time.

Fat content.

Acidity.

The chemical.

The packaging material.

Whether the container is new or degraded.

Whether it is being used as intended.

A 2025 systematic review examining phthalates, bisphenols, and PFAS found evidence across numerous studies that some of these compounds can migrate from food-packaging materials into food.[8]

That doesn't mean every package produces a dangerous exposure.

Again, migration does not automatically equal harmful dose.

But it changed how I thought about something as mundane as reheating leftovers.

Heat can influence chemical migration.

So can repeated wear.

A container intended for one use may not be designed for years of heating, scratching, dishwashing, and reuse.

My goal became simple:

Use materials according to their intended purpose.

Avoid unnecessary heating of food in plastic when another practical option exists.

Replace damaged containers.

Don't assume that "BPA-free" necessarily means every substitute has been proven biologically inert.

These are not acts of fear.

They are small exposure decisions.

One Chemical Goes Away. What Replaces It?

This raises another problem in environmental health:

regrettable substitution.

We identify concern about a particular chemical.

Manufacturers respond.

The chemical disappears from products.

That sounds like progress.

And sometimes it is.

But if the replacement has similar properties and has been studied less extensively, we can end up exchanging a known concern for an incompletely understood substitute.

"BPA-free" is a useful example of why consumers need to look beyond a single label claim.

Bisphenol A has received enormous scientific and public attention.

In response, manufacturers have sometimes used other bisphenols.

But replacing one member of a chemical family with another does not automatically resolve every biological question.

This is not an argument against reformulation.

It is an argument for evaluating chemical classes and function, not simply playing regulatory whack-a-mole one molecule at a time.

The Couch Has Chemistry Too

Some product exposures are even less obvious.

Take a sofa.

Or a mattress.

Or insulation.

Or electronics.

Historically, manufacturers have used various flame-retardant chemicals to reduce ignition or slow the spread of fire in certain materials.

The purpose makes sense.

Fire kills.

Reducing flammability can save lives.

But some flame retardants have raised concerns because they can migrate out of materials and accumulate in indoor dust or the broader environment.

EPA's evaluation of TCEP, one organophosphate flame retardant, found that the chemical can leach from products because it is not chemically bonded to the material in which it is used. EPA concluded in its risk evaluation that certain uses presented unreasonable risks, including cancer and noncancer effects.[9]

That does not mean every flame retardant has the same toxicology.

It does not mean every couch is dangerous.

It means again that function and safety have to be evaluated together.

A chemical can solve one problem while creating another.

Modern toxicology increasingly asks whether we can achieve the same useful function with substances that present less hazard.

That is exactly the philosophy behind programs such as EPA's Safer Choice, which evaluates ingredients within functional classes and identifies alternatives with more favorable human-health and environmental profiles.[10]

That idea appeals to me.

Not:

Ban chemistry.

But:

Use better chemistry.

Pesticides: The Dose-and-Benefit Conversation

Few subjects produce more polarized environmental-health discussions than pesticides.

One side can make them sound like pure poison.

The other can make concern about them sound irrational.

Neither approach is particularly useful.

Pesticides are designed to affect living organisms.

That is their purpose.

The category includes insecticides, herbicides, fungicides, rodenticides, antimicrobials, and other substances used to prevent, destroy, repel, or control pests.[11]

They also provide real benefits.

They protect crops.

Control disease vectors.

Prevent infestations.

Reduce certain fungal contaminants.

Protect homes and public spaces.

The meaningful question is not whether pesticides are "good" or "bad."

It is:

What pesticide? What toxicity? What exposure?

EPA describes pesticide health risk in a wonderfully simple equation:

Risk = Toxicity × Exposure.[12]

A highly toxic substance with no meaningful exposure may create little practical risk.

A lower-toxicity chemical experienced at substantial exposure may create a different risk.

That framework applies to far more than pesticides.

It is one of the clearest ways to think about this entire book.

Pesticides on Food

Pesticide residues can remain on foods.

That fact alone is sometimes presented online as evidence that conventional produce is dangerous.

But detection and risk are not the same thing.

EPA establishes legal tolerances for pesticide residues in food after evaluating toxicity, expected residues, dietary exposure, drinking-water exposure, and other relevant exposure routes. The agency is required to determine that the proposed use meets a standard of reasonable certainty of no harm.[11]

USDA's most recently published annual Pesticide Data Program summary found that, when pesticide residues were detected in sampled foods, they were nearly always below EPA tolerances.[13]

That context matters.

It is scientifically inaccurate to treat every detected pesticide molecule as equivalent to poisoning.

At the same time, reducing unnecessary exposure is reasonable.

EPA recommends washing produce under running water, peeling or trimming when appropriate, and eating a varied diet rather than relying heavily on the same foods from the same sources.[14]

Organic agriculture also uses pesticides.

"Organic" does not mean pesticide-free.

It refers to a different production and regulatory framework.

Again, labels can tell us something.

They rarely tell us everything.

"Natural" May Be the Most Misunderstood Word in the Store

Perhaps no word in the consumer marketplace carries more implied goodness than:

Natural.

Natural sounds safe.

Gentle.

Healthy.

Compatible with the body.

But nature has never promised us safety.

Poison ivy is natural.

Arsenic is natural.

Botulinum toxin is natural.

Snake venom is natural.

Mold is natural.

Some essential oils can irritate skin, trigger allergic reactions, or become phototoxic under certain conditions.

FDA specifically warns that plant-derived or essential-oil ingredients should not automatically be assumed safe merely because they are natural. Some botanical oils can irritate or injure skin, particularly depending on concentration and use.[15]

A substance's origin tells us where it came from.

It does not tell us its toxicology.

This is one of the most important corrections I made in my own thinking.

I stopped asking:

Is it natural?

And started asking:

Is it appropriate for this use, at this concentration, for this person?

That is a far more useful question.

Essential Oils Are Powerful Because They Are Chemicals

Essential oils are a perfect example.

I like many of them.

Plants produce fascinating chemical compounds.

But the reason an essential oil has a scent, an antimicrobial property, or a biological effect is precisely because it contains active chemistry.

Concentrating plant compounds can dramatically change exposure.

A cup of herbal tea and concentrated essential oil are not biologically equivalent simply because they came from the same plant.

This doesn't make essential oils bad.

It makes them potent.

And potency deserves respect.

When we call something natural and therefore harmless, we can accidentally remove the caution we would apply to a synthetic product.

The body doesn't care whether a molecule grew on a tree or came from a laboratory.

It encounters molecular structure.

Dose.

Route.

Timing.

The Problem Isn't One Product

This brought me back to the bucket.

One shampoo.

One cleaner.

One plastic container.

One pesticide residue.

One scented candle.

One piece of furniture.

One food wrapper.

One product rarely tells the entire story.

Modern toxicological assessment often evaluates substances individually because that is how chemicals are regulated and studied.

But human life happens in mixtures.

We wake up and apply products to our skin.

We breathe indoor air.

We drink water.

We eat packaged food.

We sit on treated furniture.

We touch plastics.

We clean our homes.

We travel through outdoor pollution.

Then we do it again the next day.

That does not mean all these exposures add together in a simple arithmetic equation.

Different chemicals are absorbed, distributed, metabolized, and eliminated differently.

Some act through completely different biological pathways.

Some exposures may be trivial.

Others matter greatly.

The scientific challenge of understanding mixtures and cumulative exposure is much more complicated than filling a literal bucket.

But as a metaphor, the bucket still helps me ask a useful question:

Which exposures are necessary, and which are optional?

That became my approach.

I cannot eliminate every chemical exposure.

Nobody can.

Nor would I want to.

Modern chemistry gives us medicines, clean drinking water, safe food, medical equipment, flame resistance, sanitation, technology, and an extraordinary quality of life.

The goal is not chemical purity.

The goal is reducing unnecessary exposures when reasonable alternatives exist.

I Stopped Trying to Live in a Bubble

There is a point in environmental-health awareness where knowledge can become exhausting.

You can read enough labels to become afraid of everything.

I didn't want that.

I had already spent too much time feeling that my environment controlled me.

I wanted knowledge to give me more freedom, not less.

So instead of trying to eliminate everything, I began prioritizing.

Ventilate when using strong cleaning products.

Use fragrance-free products when possible and when fragrance adds no benefit for me.

Don't mix cleaners.

Choose products based on ingredients and credible certifications rather than marketing words alone.

Use food containers appropriately.

Avoid unnecessarily heating food in damaged plastic.

Wash produce.

Limit pesticide use in and around the home to situations where it is actually needed and follow label directions.

Pay attention when my body reacts consistently to a particular product.

And when I want a lower-hazard cleaning product, look for meaningful third-party standards rather than trusting the word green on the front of the bottle.

EPA's Safer Choice program is one example. Products carrying that label undergo ingredient review against human-health and environmental criteria, and EPA also identifies qualifying fragrance-free products.[10]

None of this creates a toxin-free life.

That was never my goal.

It creates a more informed one.

Trust, but Ask Better Questions

I still use cosmetics.

I still clean my house.

I still buy packaged food.

I still use plastic.

I live in the twenty-first century.

This chapter isn't an argument that ordinary consumer products are secretly poisoning everyone.

It is an argument against blind trust at either extreme.

Don't assume a product is harmless simply because it is sold in a store.

But don't assume it is dangerous merely because it contains a chemical name you cannot pronounce.

Don't assume synthetic means toxic.

Don't assume natural means safe.

Don't assume a detectable exposure is automatically harmful.

Don't assume that because most people tolerate something, everyone will.

Instead, ask better questions.

What is the substance?

What does it do?

How am I exposed?

At what dose?

How often?

Is the exposure necessary?

Is there a practical lower-exposure alternative?

And does my body repeatedly tell me something that deserves investigation?

That last question matters to me more than it once did.

Because I spent years believing that if a product bothered me but everyone else seemed fine, the problem had to be me.

My health journey taught me to see that differently.

Sometimes a reaction means allergy.

Sometimes irritation.

Sometimes sensitization.

Sometimes the product is being misused.

Sometimes another medical condition is responsible.

And sometimes we don't yet know.

But the appropriate response is not automatic fear.

Nor is it automatic dismissal.

It is curiosity.

That is what the canary teaches us.

The canary does not tell us to abandon the mine.

It tells us to understand the air.

And in a world filled with products we touch, breathe, eat from, clean with, spray, apply, and trust every day, understanding may be one of the most powerful forms of protection we have.

References

1. U.S. Food and Drug Administration. Modernization of Cosmetics Regulation Act of 2022 (MoCRA). FDA describes MoCRA as the most significant expansion of federal cosmetics authority since the Federal Food, Drug, and Cosmetic Act of 1938 and notes that people use an average of approximately six to twelve cosmetic products daily. (U.S. Food and Drug Administration)

2. U.S. Food and Drug Administration. Using Cosmetics Safely. Explains cosmetic labeling, the limits of terms such as "hypoallergenic," "natural," and "organic," and notes that most cosmetics and cosmetic ingredients other than color additives do not require FDA approval before marketing. (U.S. Food and Drug Administration)

3. U.S. Food and Drug Administration. Fragrances in Cosmetics. Reviews safety requirements for fragrance ingredients and explains that individual fragrance ingredients generally may be declared collectively as "Fragrance" on cosmetic ingredient labels. (U.S. Food and Drug Administration)

4. U.S. Environmental Protection Agency. Volatile Organic Compounds' Impact on Indoor Air Quality. Identifies cleaning, disinfecting, cosmetic, paint, solvent, and other household products as sources of indoor VOCs and notes that concentrations of many VOCs are higher indoors than outdoors. (US EPA)

5. U.S. Environmental Protection Agency. Biological Contaminants and Indoor Air Quality. Provides guidance on cleaning-product use, ventilation, proper dilution, and the danger of mixing bleach or other incompatible cleaning chemicals. (US EPA)

6. U.S. Environmental Protection Agency. Does EPA Regulate Volatile Organic Compounds in Household Products?Explains why "low VOC" or "no VOC" should not automatically be interpreted as non-toxic and why total VOC measurements alone cannot determine product safety. (US EPA)

7. Tumu, K., Vorst, K., & Curtzwiler, G. Endocrine modulating chemicals in food packaging: A review of phthalates and bisphenols. Comprehensive Reviews in Food Science and Food Safety (2023). Reviews the use and migration of bisphenols and phthalates in food-contact materials and their potential endocrine activity. (PubMed)

8. Systematic Review. Phthalates, bisphenols and per- and polyfluoroalkyl substances migration from food packaging into food (2025). Reviews 67 studies and more than 5,000 samples examining migration of several chemical classes from packaging materials into foods. (PubMed)

9. U.S. Environmental Protection Agency. EPA Finalizes Risk Evaluation for Flame Retardant TCEP. Reviews uses and environmental release of TCEP and EPA's conclusions regarding unreasonable risks from certain uses, including kidney cancer and noncancer health effects. (US EPA)

10. U.S. Environmental Protection Agency. Safer Choice Standard and Criteria; Safer Chemical Ingredients List.Describes EPA's voluntary Safer Choice program, which evaluates ingredients by functional class against human-health and environmental criteria and provides an additional fragrance-free designation for qualifying products. (US EPA)

11. U.S. Environmental Protection Agency. Setting Tolerances for Pesticide Residues in Foods. Explains EPA's evaluation of pesticide toxicity, food residues, drinking-water exposure, residential exposure, and vulnerable populations when establishing pesticide residue limits. (US EPA)

12. U.S. Environmental Protection Agency. Assessing Human Health Risk from Pesticides. Describes pesticide risk as a function of both toxicity and exposure and discusses additional protections used in evaluating risks to infants and children. (US EPA)

13. U.S. Department of Agriculture, Agricultural Marketing Service. Pesticide Data Program Annual Summary, Calendar Year 2024. Published December 2025. USDA reports that when pesticide residues were detected in sampled foods, they were nearly always below EPA-established tolerances. (AMS)

14. U.S. Environmental Protection Agency. Pesticides and Food: Healthy, Sensible Food Practices. Recommends washing produce under running water, peeling or trimming when appropriate, and eating a varied diet to help reduce pesticide exposure. (US EPA)

15. U.S. Food and Drug Administration. Aromatherapy. Explains that "natural" or plant-derived fragrance and essential-oil ingredients are not automatically safe and that certain botanical oils can cause irritation, allergic reactions, blistering, or phototoxic effects depending on their use. (U.S. Food and Drug Administration)

16. U.S. Environmental Protection Agency. Frequently Asked Questions on Safer Choice. Explains that products marketed as "natural" are not necessarily safer and that the safety of a cleaning product depends on its actual ingredients and their properties rather than whether those ingredients originated from biological or petroleum sources. (US EPA)

Chapter 5

The Food We Eat

Food may be the most personal environmental exposure of all.

We don't simply encounter it.

We deliberately put it inside our bodies.

Several times a day.

Every day.

For decades.

Food becomes energy, hormones, enzymes, neurotransmitters, cell membranes, muscle, bone, and tissue. It feeds us, comforts us, connects us to family and culture, and keeps us alive.

And modern food is extraordinary.

We can walk into a grocery store in the middle of winter and buy strawberries.

We can keep milk refrigerated for weeks.

We can eat foods produced thousands of miles away.

We can open a package and have dinner ready in minutes.

Modern agriculture and food science have made food safer, more abundant, more convenient, and more accessible than at almost any other time in human history.

But convenience has also changed what food is.

For much of human history, people ate foods that still looked relatively similar to where they came from.

Plants.

Animals.

Seeds.

Nuts.

Grains.

Fruit.

Vegetables.

Fermented foods.

Today, an increasing proportion of what many of us eat is something different.

Food has become engineered.

Formulated.

Preserved.

Colored.

Flavored.

Texturized.

Sweetened.

Stabilized.

Packaged.

And designed to remain appealing for months—or sometimes years.

Once I began thinking about cumulative exposure, I stopped looking only at calories, fat, protein, and carbohydrates.

I started reading the rest of the label.

And I discovered that food, like air, water, and consumer products, is far more complicated than the categories of healthy and unhealthy.

When Food Becomes a Formula

There is a difference between processed food and ultra-processed food.

Processing itself is not inherently harmful.

Cooking is processing.

Freezing is processing.

Pasteurization is processing.

Canning is processing.

Fermentation is processing.

Grinding wheat into flour is processing.

Some forms of processing make food safer, more digestible, more nutritious, and more accessible.

The concern increasingly being studied is something more specific: ultra-processed foods, or UPFs.

The NOVA classification system describes ultra-processed foods as industrial formulations that often contain ingredients rarely used in home cooking—such as certain emulsifiers, modified starches, flavorings, colorants, sweeteners, and other additives—combined to create highly convenient, palatable products.

Think:

Soft drinks.

Packaged snack cakes.

Certain chips.

Candy.

Some breakfast cereals.

Instant meals.

Processed meat products.

Frozen prepared foods.

Many packaged desserts.

Some protein bars.

The category is imperfect, and scientists continue to debate exactly where certain foods belong.

But the health signal is becoming difficult to ignore.

A major 2024 umbrella review published in The BMJ examined 45 pooled analyses involving nearly 10 million people. Greater exposure to ultra-processed foods was associated with higher risk across numerous health outcomes, with particularly concerning associations involving cardiovascular disease, type 2 diabetes, obesity, common mental-health outcomes, and mortality.[1] (BMJ)

Most of that evidence is observational.

That matters.

People who eat more ultra-processed food may differ in other important ways from people who eat less of it. Diet quality, exercise, income, education, smoking, sleep, and access to fresh food can all complicate the picture.

Association is not automatically causation.

But one fascinating experiment moved the conversation further.

The Experiment That Made People Eat More

In a controlled NIH study, researchers brought twenty adults into the NIH Clinical Center and provided them with either an ultra-processed diet or a minimally processed diet for two weeks, then switched them to the other diet.

The diets were designed to be matched for presented calories, sugar, fat, sodium, fiber, and macronutrients.

Participants were allowed to eat as much or as little as they wanted.

When people were eating the ultra-processed diet, they consumed about 500 more calories per day and gained weight.

When they ate the minimally processed diet, they lost weight.[2] (National Institutes of Health)

Twenty people is a small study.

It doesn't answer every question about ultra-processed food.

But it raises an important one:

What if the way food is engineered influences how much we eat independently of the nutrition numbers printed on the label?

Texture may matter.

Eating speed may matter.

Energy density may matter.

Palatability may matter.

The structure of the food itself may matter.

And perhaps the conversation about nutrition has been too focused on individual nutrients while paying too little attention to the food matrix they arrive in.

A hundred calories of an apple and a hundred calories of candy may contain the same amount of energy on paper.

But the body does not experience them as identical foods.

Convenience Has a Cost—and a Benefit

I don't believe the answer is to declare every packaged food dangerous.

That would ignore reality.

Ultra-processed foods are often inexpensive.

Portable.

Shelf-stable.

Accessible.

They save time for working families.

They can provide calories to people who might otherwise skip meals.

Some are fortified with nutrients.

Some make food safer or more available.

And not every product classified as ultra-processed has the same nutritional profile.

A fortified whole-grain cereal and a frosted snack cake may technically occupy the same broad classification while offering very different amounts of fiber, sugar, protein, and micronutrients.

So I began using a simpler rule.

Instead of asking:

"Is this processed?"

I ask:

"How closely does this food still resemble food?"

And:

"What proportion of my diet is made from foods that require an ingredient label at all?"

An apple doesn't need one.

Neither does broccoli.

A potato doesn't need one.

Eggs don't need one.

The more foods like these became the foundation of my diet, the less time I had to spend worrying about deciphering chemistry on the back of a package.

The Ingredient List

Once I started reading food labels, another word became impossible to avoid:

Additives.

Food additives perform real functions.

They keep oils from separating.

Improve texture.

Prevent spoilage.

Maintain freshness.

Preserve flavor.

Control acidity.

Add sweetness.

Restore nutrients.

Prevent microbial growth.

Make products visually consistent.

Some of these functions are enormously beneficial.

Preservatives, for example, are not simply chemicals added to make food last longer for corporate convenience.

They can prevent the growth of dangerous microorganisms.

FDA notes that preservatives can inhibit mold, bacteria, fungi, and yeast and can help prevent potentially life-threatening foodborne illnesses, including botulism.[3] (U.S. Food and Drug Administration)

So "contains preservatives" does not automatically mean "unhealthy."

Salt is a preservative.

Sugar can preserve food.

Vinegar preserves food.

Humans have been preserving food for thousands of years.

Again, the useful question isn't:

Does this contain an additive?

It is:

Which additive, at what amount, and what does the evidence say about it?

How Food Additives Are Regulated

In the United States, substances intentionally added to food generally fall under FDA's food-additive framework unless they qualify for another regulatory category, including substances considered Generally Recognized as Safe, or GRAS.

FDA's safety standard for food additives is a reasonable certainty of no harm under the intended conditions of use.

Regulators consider how much of the substance people are expected to consume, what foods contain it, how it is metabolized, toxicological studies, and exposure across the population. Safety margins are incorporated to account for uncertainties and vulnerable groups.[4] (U.S. Food and Drug Administration)

The GRAS pathway has also generated debate about transparency and oversight.

As of August 2026, FDA has proposed changes intended to strengthen oversight of substances claimed to be GRAS, reflecting continuing efforts to modernize the system as scientific knowledge evolves.[5] (U.S. Food and Drug Administration)

This is important because regulation is not a one-time declaration that freezes science forever.

New evidence emerges.

Exposure patterns change.

Testing improves.

And sometimes regulators reconsider decisions made decades earlier.

That does not prove that today's approved additives are secretly unsafe.

It shows something much more reasonable:

Science is a process.

Why Does My Food Need to Be Blue?

Artificial colors became one of the areas I found most interesting because color contributes almost nothing nutritionally to a food.

We eat first with our eyes.

Manufacturers know this.

Bright cereal appeals to children.

Candy becomes more exciting.

Drinks look fruitier.

A strawberry-flavored product somehow feels more like strawberry if it is bright red.

Color additives can compensate for color lost during processing or storage, correct natural variations, or simply make products more visually appealing.

FDA requires color additives to meet safety requirements for their intended uses. Some are synthetically produced and require batch certification; others are exempt from that certification process but still must meet applicable safety standards.[6] (U.S. Food and Drug Administration)

The phrase artificial color does not automatically mean toxic.

And a color derived from a plant is not automatically safer.

But artificial colors also illustrate an important question about unnecessary exposure.

If an ingredient provides no nutritional benefit and exists primarily to make a product more visually enticing, I can reasonably decide that I don't need it—even without declaring it poison.

That distinction has become central to how I make choices.

I don't need to prove something will harm me before deciding that it serves no meaningful purpose in my diet.

Sometimes reducing exposure is simply a preference.

Preserving Food Without Losing Perspective

Preservatives generate similar anxiety.

Names like sodium nitrite, sodium benzoate, potassium sorbate, BHA, or BHT can look alarming simply because they sound unfamiliar.

But unfamiliar pronunciation is not toxicology.

Nitrites provide a good example of how complicated this becomes.

Nitrites are used in certain cured meats to help preserve color and flavor and, importantly, inhibit the growth of Clostridium botulinum, the organism capable of causing botulism.[7] (Food Safety and Inspection Service)

But processed meats have also been associated with increased colorectal-cancer risk, and scientists have investigated mechanisms involving compounds formed during processing, cooking, or digestion.

The lesson is not:

Preservatives are bad.

Nor is it:

If a preservative is permitted, unlimited consumption is irrelevant.

The better lesson is about dietary patterns.

Eating an occasional piece of bacon is a very different exposure than making processed meat the foundation of every meal.

Once again:

Dose and frequency matter.

Pesticides Return to the Plate

Pesticides appeared in the previous chapter because they are consumer products.

But for most people, the more important question is what remains on the food we eat.

Pesticides protect crops from insects, weeds, fungi, and other threats.

Without pest control, food production would be less predictable, some crops would suffer substantial losses, and certain foods could become more expensive.

But because pesticides are biologically active substances designed to affect living organisms, their residues are regulated.

EPA establishes tolerances—the maximum amount of a pesticide residue legally permitted on or in specific foods—based on toxicology and estimates of human exposure.

USDA then conducts extensive surveillance.

In the 2024 Pesticide Data Program, published in January 2026, USDA tested 9,872 food samples. More than 99 percent had pesticide residues below EPA benchmark levels.[8] (AMS)

That number matters.

If we are going to talk about pesticides honestly, we should not imply that conventionally grown produce is routinely saturated with pesticide residues above legal safety standards.

The data do not support that claim.

But another truth can exist beside it.

Choosing organic foods can reduce exposure to certain pesticide residues.

Both statements can be true.

Organic Versus Conventional: A False War

I wish we talked about organic food with more nuance.

One side sometimes describes organic food as inherently clean and conventional agriculture as toxic.

The other dismisses organic food as expensive marketing.

Neither tells the whole story.

Organic farming follows specific production standards, including restrictions on many synthetic pesticides and fertilizers.

But organic does not mean pesticide-free.

Organic farmers can use permitted pesticides.

Those substances still have biological properties and must be used appropriately.

What the research does consistently suggest is that people consuming organic diets tend to have lower exposure to certain pesticide residues.

Clinical dietary studies have found reductions in urinary metabolites of several pesticides when participants switch from conventional to organic foods.[9][10] (PubMed Central (PMC))

What is much less certain is how much that reduction translates into differences in long-term human health.

Some observational studies associate higher organic-food consumption with favorable health outcomes, but people who regularly buy organic foods often differ in many other ways. They may exercise more, smoke less, have higher incomes, consume more fruits and vegetables, and have better access to healthcare.

Those differences make causation difficult to establish.

Recent systematic reviews continue to conclude that organic diets reliably reduce pesticide exposure, while evidence that organic food itself produces major long-term health advantages remains less definitive.[10][11] (PubMed)

So my approach is practical.

If organic is available and affordable, particularly for foods I eat frequently, I may choose it.

If it isn't, I still eat the fruit and vegetables.

Because avoiding produce out of fear of pesticide residues would likely undermine one of the most consistently supported principles in nutrition:

Eat more plants.

Perfection should not become the enemy of health.

Wash the Apple

There are also remarkably simple ways to reduce some surface contamination.

Wash fruits and vegetables under running water.

Remove damaged outer leaves.

Peel foods when appropriate.

Eat a varied diet.

These steps will not remove every pesticide because some pesticides can be systemic—meaning they are taken up into the plant itself.

But washing produce also removes dirt, microbes, and some surface residues.

And variety matters for another reason.

Eating different foods from different sources helps prevent a diet from becoming dominated by one particular exposure.

Variety isn't merely nutritional.

It can be an exposure strategy too.

Hormones: What Is Actually Allowed?

The word hormones on a food label or social-media post can quickly create alarm.

But the reality is more specific than most discussions suggest.

FDA has approved certain steroid hormone implants for use in beef cattle and sheep to promote growth and improve feed efficiency.

These include naturally occurring hormones such as estrogen, progesterone, and testosterone, as well as synthetic versions or related compounds.

FDA evaluates these products for the safety of food from treated animals before approving them.[12] (U.S. Food and Drug Administration)

But here's something many consumers don't realize:

No steroid hormone implants are approved for growth purposes in poultry or pigs.

So packages of chicken or pork marketed as "raised without added hormones" can create the impression that the competing product contains hormones that were never legally permitted for growth promotion in those species in the first place.

Again:

Marketing matters.

Words matter.

And fear can sell products just as effectively as flavor.

Hormones are also naturally present in animal tissues regardless of farming method because animals—like humans—produce hormones biologically.

The question isn't whether a food contains any hormone molecules.

The question is whether veterinary drugs were used, what residues remain, and whether those residues fall within established safety limits.

Food Is Not Just Ingredients

Eventually, I realized I was making the same mistake with food that medicine had made with my body.

I was breaking it into pieces.

Protein.

Carbohydrate.

Fat.

Sugar.

Sodium.

Fiber.

Calories.

Vitamin D.

Iron.

Then additives.

Colors.

Preservatives.

Pesticides.

But food is more than the sum of its label.

An orange isn't simply vitamin C plus sugar plus fiber.

Beans aren't simply carbohydrate plus protein.

Olive oil isn't simply fat.

Food has structure.

Thousands of naturally occurring compounds.

Fiber matrices.

Polyphenols.

Micronutrients.

Water.

Texture.

And interactions we are still learning to understand.

Perhaps this is one reason nutrition studies are so difficult.

Humans don't eat nutrients.

We eat food.

And we don't eat individual foods in isolation.

We eat dietary patterns over lifetimes.

My Body Changed the Way I Ate

Living with a body that had become increasingly reactive made food more complicated for me.

When hives, food sensitivities, gastrointestinal symptoms, MCAS, dysautonomia, and Long COVID entered the picture, eating was no longer just about nutrition.

Food could become information.

I began noticing patterns.

Some foods seemed to agree with me.

Others didn't.

Some reactions were consistent.

Others were not.

And this is where individualized medicine becomes important.

A food that causes symptoms in someone with a specific allergy, intolerance, metabolic condition, or mast-cell disorder may be perfectly well tolerated by another person.

That does not make the food inherently toxic.

And it does not make the reaction imaginary.

Both facts can coexist.

This realization helped me stop trying to create universal rules out of my own experience.

My body is evidence about my body.

It can lead me to questions.

It can help me identify patterns.

It may even point toward scientific questions relevant to others.

But my individual reaction cannot prove that a particular food is harmful to everyone.

That distinction matters deeply to me.

Because credibility requires knowing the difference between:

what happened to me

and

what science has demonstrated more broadly.

The Cumulative Plate

Still, I kept returning to the idea of cumulative burden.

Not because every food additive accumulates in the body.

Most do not.

Not because eating a single brightly colored candy changes someone's health trajectory.

It probably doesn't.

But consider the pattern.

Breakfast cereal.

Flavored coffee creamer.

Packaged snack.

Fast-food lunch.

Diet soda.

Protein bar.

Frozen dinner.

Dessert.

Tomorrow, repeat.

An individual additive may exist well below an established safety threshold.

An individual pesticide residue may be far below its tolerance.

A preservative may have decades of safe use.

Yet the modern diet can contain combinations of substances and foods our grandparents encountered far less frequently.

Understanding those mixtures is an active scientific challenge.

We should be careful not to claim evidence where evidence does not yet exist.

But we should also recognize that absence of complete knowledge is not the same thing as proof that every combination is biologically irrelevant.

For me, the solution isn't fear.

It is reducing the number of unnecessary variables.

Eat Food More Often Than Food Products

I eventually arrived at a philosophy that is remarkably simple.

Eat more foods with one ingredient.

Vegetables.

Fruit.

Beans.

Lentils.

Nuts.

Seeds.

Eggs.

Fish.

Meat, if you eat it.

Whole grains.

Foods prepared from recognizable ingredients.

This doesn't mean I never eat a chip.

Or dessert.

Or restaurant food.

Or something from a package.

That isn't realistic, and I don't want food to become another source of anxiety.

I simply changed the ratio.

The goal isn't:

Never eat ultra-processed food.

It is:

Don't let ultra-processed food become the foundation of the diet.

The same applies to organic food.

Buy organic when it makes sense for you.

Buy conventional when it doesn't.

Wash your produce.

Eat variety.

Read labels without becoming afraid of chemistry.

Be skeptical of foods marketed as healthy simply because they say natural, organic, gluten-free, non-GMO, keto, or high protein across the front.

Turn the package around.

The real story is usually on the back.

Food Should Not Become Something We Fear

Once you begin learning about environmental exposures, food can become frightening very quickly.

Pesticides.

Hormones.

Colors.

Preservatives.

Plastics.

PFAS in packaging.

Microplastics.

Heavy metals.

Additives.

It is possible to reach a point where there seems to be nothing left to eat.

I refuse to live there.

Food is not the enemy.

Food is life.

The purpose of understanding these exposures is not to become afraid of dinner.

It is to make informed decisions where those decisions are practical.

I don't need perfect food.

I need nourishment.

I need variety.

I need enough protein.

Enough fiber.

Enough fruits and vegetables.

Enough calories.

And I need to enjoy eating.

Environmental health should expand our options, not imprison us inside an impossible standard of purity.

Because there is no perfect diet.

No perfect grocery store.

No completely exposure-free food.

And no scientific justification for believing that one unconventional ingredient or one conventionally grown strawberry determines our fate.

Our bodies experience patterns.

Repeated choices.

Repeated exposures.

Repeated nourishment.

Over years.

That perspective changed everything for me.

I stopped asking:

"Is this food toxic?"

And started asking:

"What pattern am I building?"

Because one meal is a moment.

A diet is a lifetime.

And when we think about cumulative burden, resilience, and the bodies that may react sooner than others, perhaps the most meaningful intervention isn't finding one frightening ingredient and eliminating it forever.

Perhaps it is much simpler.

Give the body more of what nourishes it—and less of what it doesn't need.

That isn't fear.

That is stewardship.

And for the canaries among us, it may be another way of listening before the body has to scream.

References

1. Lane, M. M., et al. Ultra-processed food exposure and adverse health outcomes: umbrella review of epidemiological meta-analyses. The BMJ (2024). This umbrella review examined 45 pooled analyses involving nearly 10 million participants and found greater ultra-processed-food exposure was associated with numerous adverse health outcomes, although much of the evidence was rated low or very low quality. (BMJ)

2. Hall, K. D., et al. Ultra-Processed Diets Cause Excess Calorie Intake and Weight Gain: An Inpatient Randomized Controlled Trial of Ad Libitum Food Intake.Cell Metabolism (2019); summarized by the National Institutes of Health. In the controlled trial, participants consumed more calories and gained weight while eating the ultra-processed diet compared with the minimally processed diet. (National Institutes of Health)

3. U.S. Food and Drug Administration. Food Additives and GRAS Ingredients — Information for Consumers.Reviews the functions of food additives, including preservation, prevention of microbial spoilage, maintenance of freshness, and FDA's safety framework. (U.S. Food and Drug Administration)

4. U.S. Food and Drug Administration. Understanding How the FDA Regulates Food Additives and GRAS Ingredients. Explains FDA's "reasonable certainty of no harm" standard and consideration of expected intake, metabolism, toxicology, lifetime exposure, and vulnerable populations. (U.S. Food and Drug Administration)

5. U.S. Food and Drug Administration. Generally Recognized as Safe (GRAS). FDA information on the GRAS pathway and its August 10, 2026 proposal to enhance oversight and transparency for substances claimed as GRAS. (U.S. Food and Drug Administration)

6. U.S. Food and Drug Administration. Color Additives in Foods. Explains the reasons food colors are used, FDA premarket safety requirements for color additives, permitted uses, labeling, and certification requirements. (U.S. Food and Drug Administration)

7. U.S. Department of Agriculture, Food Safety and Inspection Service. Additives in Meat and Poultry Products.Reviews the roles of direct food additives, preservatives, color additives, and substances such as nitrites used in meat and poultry products. (Food Safety and Inspection Service)

8. U.S. Department of Agriculture, Agricultural Marketing Service. 2024 Pesticide Data Program Annual Summary. Published January 6, 2026. USDA reported that more than 99% of the 9,872 samples tested had pesticide residues below benchmark levels established by EPA. (AMS)

9. Vigar, V., et al. A Systematic Review of Organic Versus Conventional Food Consumption: Is There a Measurable Benefit on Human Health? Nutrients (2020). Organic-diet interventions consistently reduced biomarkers of exposure to some pesticides, while evidence for clinically meaningful long-term health benefits remained insufficient for firm conclusions. (PubMed Central (PMC))

10. Effects of Organic Food on Human Health: A Systematic Review and Meta-analysis of Population-Based Studies (2023). The review found organic food consumption associated with lower pesticide-exposure biomarkers while emphasizing that more long-term research is needed to establish effects on individual diseases. (PubMed)

11. Poulia, K.-A., et al. Impact of organic foods on chronic diseases and health perception: a systematic review of the evidence. European Journal of Clinical Nutrition (2025). Clinical trials consistently found lower pesticide exposure with organic diets, but evidence concerning nutritional superiority, cancer risk, and overall long-term health advantage remained inconclusive. (Nature)

12. U.S. Food and Drug Administration. Steroid Hormone Implants Used for Growth in Food-Producing Animals.FDA explains that certain steroid hormone implants are approved for growth promotion in beef cattle and sheep, while none are approved for growth purposes in poultry, pigs, dairy cows, or veal calves. (U.S. Food and Drug Administration)