Hi there,

Microplastics are in your vegetables.

The internet’s worst possible answer is: throw out the vegetables.

Please do not let the algorithm plan dinner.

The better takeaway is that contamination has moved upstream: water, soil, dust, packaging, textiles, cookware, and consumer products.

The useful question is not “How toxic am I?”

It is: which exposures repeat often enough to matter and are actually under my control?

Don’t go down a detox rabbit hole. Do not fear the broccoli.

Start with source control.

Most longevity advice adds things: labs, powders, protocols, devices.

This issue is about subtraction.

Not purity. Not panic. Just fewer repeat hits from the things touching your body every day.

Nobody gets extra healthspan points for becoming the least fun dinner guest.

PFAS are per- and polyfluoroalkyl substances: chemicals used to make products resist water, grease, stains, heat, and friction. Many persist in the environment. Some persist in the body for years.

Microplastics are plastic particles under 5 millimeters. Nanoplastics are smaller, often under 1 micron, and harder to measure well.

Same exposure ecosystem. Different biology.

For PFAS, the clinical signal is more mature. A National Academies review found sufficient evidence linking PFAS exposure with decreased antibody response, dyslipidemia, decreased fetal and infant growth, and kidney cancer.

For microplastics, the human evidence is newer. Particles have been detected in blood, stool, placenta, breast milk, reproductive tissue, liver, and arterial plaque. A 2024 New England Journal of Medicine study found higher cardiovascular event risk among people whose carotid plaques contained microplastics or nanoplastics. Important signal. Not a personal dose-response calculator.

The FDA’s current position is cautious: current evidence does not show that detected food levels pose a human-health risk, and measurement still needs work.

My read:

PFAS are the more clinically mature concern. Microplastics are the fast-emerging concern. Both deserve source control. Neither deserves sloppy fear.

One more rule of thumb: pay attention to repeated contact plus heat, grease, fragrance, waterproofing, stain resistance, or mystery coatings. “BPA-free” can still mean another bisphenol; reviews find BPS and BPF can show endocrine activity in the same general direction as BPA.

Marketing moves faster than toxicology, which is rude but consistent.

Some models suggest fruits, vegetables, and grains may contribute to micro/nanoplastic particle intake. Experimental work in Nature Sustainability has shown tiny plastic particles moving into wheat and lettuce roots under controlled conditions. A 2024 exposure model also put crop foods near the center of possible exposure, with major assumptions because the data are still thin.

That does not mean vegetables are bad.

It means industrial contamination has reached the inputs that grow vegetables.

Different problem. Very different dinner plan.

For PFAS, food exposure can come through contaminated water, soil, biosolids, seafood, processing, packaging, and food-contact materials. FDA food testing has emphasized seafood and targeted high-risk foods, not blanket produce panic.

So keep the produce. Rinse it. Peel when appropriate. Vary sources. Check local advisories near contamination hotspots.

But do not call backyard lettuce automatically clean if the soil or irrigation water is questionable. A garden is not a force field with arugula.

The rule:

Preserve nutrient density. Reduce contaminated inputs.

Organic helps with some exposures. It is not armor against contaminated water, air deposition, biosolids, packaging, or processing. It is a farming standard inside a contaminated world.

If I had to pick one environmental exposure lane to start with, I would pick water.

Not because water is the only route. Because water is repeated, measurable, and modifiable.

The EPA finalized enforceable drinking-water limits in 2024 for several PFAS, including PFOA and PFOS at 4 parts per trillion. In 2025, EPA said it would keep the PFOA and PFOS limits while reconsidering some provisions and timelines.

Regulation matters. Your body does not wait for municipal paperwork.

Start here:

For PFAS, EPA points to granular activated carbon, ion exchange resin, and reverse osmosis when properly selected and maintained. For certification language, use EPA filter guidance: NSF/ANSI 53 for PFAS reduction claims, or NSF/ANSI 58 for reverse osmosis.

Two traps: a taste filter is not automatically a PFAS filter, and a saturated cartridge is expensive decoration.

For microplastics, reverse osmosis and membrane filtration are generally strong options, depending on particle size and maintenance. Bottled water is not automatically cleaner. A 2024 PNAS study estimated roughly 240,000 micro/nanoplastic particles per liter in tested bottled waters, mostly nanoplastics.

Filtered tap water in glass or stainless steel starts to look less like virtue signaling and more like plumbing.

The testing hierarchy is simple:

Test the source first. Test the body only when the result changes the plan.

A lab can sell you a number long before anyone can tell you what to do with it.

For PFAS in drinking water, start with public data. If the answer is missing or risk is plausible, use a lab that specifies EPA Method 533 or EPA Method 537.1. Tap Score/SimpleLab is a practical consumer route; their PFAS Water Test and GenX + PFAS kit specify those methods.

For microplastics in water, there is no useful home strip. Use lab testing only if it will change filtration or bottled-water decisions. Tap Score’s Microplastics Water Test quantifies particles down to 10 microns and flags presence or absence in the 1 to 10 micron range.

That is exposure context, not a diagnosis.

PFAS blood testing is more clinically interpretable. Quest’s PFAS 9 Panel is designed around NASEM-style guidance, using serum or plasma with PFAS-aware collection instructions.

I would consider it when exposure history is strong enough that the result changes counseling, screening intensity, or follow-up. Curiosity alone is not a lab indication, although I say this as someone who respects curiosity deeply and also owns too many PDFs.

Two people can share the same home, water filter, and diet, then end up with different body burdens. Biology varies.

One-carbon metabolism variants may modify some PFAS associations, which is different from saying an MTHFR result diagnoses a “detox problem.” Glutathione pathway enzymes like GSTP1, GSTM1, and GSTT1 are another layer: some null genotypes can reduce conjugation of certain environmental compounds.

“Start with the source” is still the default. Genetics can change how I interpret a case, but it does not make a direct-to-consumer “detox gene panel” more useful than a clinician who understands the limits of the evidence.

If the result does not change source control, screening, or treatment, it is probably anxiety with a specimen cup.

The PERTH Trial, published in Nature Medicine in 2026, tested whether reducing plastic food contact could lower urinary plastic-associated chemicals over seven days.

This was not a PFAS trial. It was about phthalates and bisphenols, which move faster than PFAS.

Still useful: a minimal-plastic food intervention lowered urinary mono-n-butyl phthalate by 37.5%, monobenzyl phthalate by 53.5%, and BPA by 59.7% in one week.

My read: repeated plastic touchpoints are not abstract. Some exposure markers move quickly when you reduce them.

The highest-yield swaps are boring:

This is not permission to become unbearable at restaurants. Please do not interrogate a server about polymer chemistry while everyone else is trying to order fries.

It is a reminder that cheap, durable exposure reductions deserve priority over most add-ons.

No panic room. No mason-jar cosplay. Just the repeat loops worth a look.

Personal note: my recent household change was popcorn. I switched from microwave bags to stovetop popcorn. Same snack, better taste, no mystery-lined bag heating next to fat.

This does not mean never eat pizza. It means the box is not a vegetable.

Some interventions can lower serum PFAS.

No, this does not vindicate every detox menu, sweating protocol, or powder that tastes like a lawn.

PFAS bind to blood proteins and can recirculate through bile. Two intervention categories make physiologic sense:

Human data exist for both. A randomized trial in Australian firefighters found that plasma donation every six weeks for 12 months reduced PFOS more than observation; whole-blood donation had a smaller effect. Cholestyramine and colesevelam also have human data lowering serum PFAS in highly exposed groups.

But this is medication-level care. For most people, start with water, food-contact materials, dust, cookware, packaging, and time.

Fiber is the boring baseline I like: oats, barley, beans, lentils, psyllium, chia, flax, and pectin-rich fruit. Pilot and observational data suggest fiber may help lower some PFAS markers, but this is not a detox protocol.

Sauna is useful for heat exposure, cardiovascular conditioning, and relaxation. For PFAS clearance, it is not the move. One study found PFHxS, PFOS, and PFOA in serum, but not in sweat, and concluded sweating did not appear to facilitate clearance of those compounds.

Use sauna if it helps you. Do not market it as PFAS clearance.

If you want the whole thing in one pass, use this hierarchy.

You cannot supplement your way around contaminated water.

You cannot sauna your way out of PFAS.

You probably do not need to fear your broccoli.

You do need to stop pretending the environment is separate from your longevity protocol.

The goal is not a chemically perfect life.

The goal is to stop making the same avoidable deposit every day.

Keep learning,

Hillary Lin, MD

To go deeper, watch my toxins/plastics conversation with Non-Toxic City Girl. The useful version of “non-toxic” is source control, not fear.

Watch on YouTube | Subscribe to The Longevity Show

🚰 PFAS water rules are moving, slowly: EPA’s May update kept the 4 ppt PFOA/PFOS drinking-water limits, but some systems may get until 2031. High-risk households should not wait passively.

🧪 Microplastics entered the federal water workflow: EPA and HHS put microplastics on the draft CCL 6 and announced STOMP to improve measurement. Measurement has to get better before treatment claims deserve confidence.

🍼 Baby food pouches had a bad week: A Greenpeace-commissioned analysis reported microplastics in every tested Gerber and Happy Baby pouch. Small sample, advocacy-commissioned, not an outcomes study. Still, spooning puree into a bowl when feasible is reasonable.

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If you want help deciding whether a PFAS blood panel, water test, or filtration plan is worth it, reply to this email or start on the PFAS & water testing guidance page. Include your water source, private-well status, and exposure history.

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