What Are PFAS?
PFAS stands for per- and polyfluoroalkyl substances — a group of over 12,000 synthetic chemicals defined by their carbon-fluorine bonds, which are among the strongest chemical bonds in existence. That strength is precisely why they're used in so many products: they repel water, resist heat, prevent sticking, and withstand corrosion. It's also why they don't break down in the environment — or in your body.
You've likely heard of the most famous PFAS: PFOA (used to make Teflon) and PFOS (used in Scotchgard and firefighting foam). These two have been phased out of US manufacturing after evidence of serious health harms, but replaced by thousands of related compounds with similar properties and, increasingly, similar concerns. The class of chemicals has been restructured but not solved.
PFAS have been produced since the 1940s. They're now so ubiquitous that they've been found in Arctic ice, deep ocean sediments, rainwater samples on every continent, and the blood of polar bears. Environmental contamination is essentially planetary.
How PFAS Get Into Your Food
The routes from PFAS manufacturing to your plate are numerous:
- Food packaging: Grease-resistant food packaging — fast food wrappers, microwave popcorn bags, pizza boxes, french fry containers — is often coated with PFAS. Heat accelerates migration into food. A 2017 FDA study found PFAS in fast food wrappers at measurable concentrations.
- Non-stick cookware: Traditional Teflon (PTFE) coatings aren't the primary concern at normal temperatures, but when overheated (above 500°F / 260°C), they can release PFAS gases. Scratched or worn non-stick coatings increase exposure risk.
- Contaminated drinking water: PFAS have been found in drinking water supplies near military bases, airports, industrial facilities, and wastewater treatment plants across the US. The EPA in 2024 set maximum contaminant levels for PFOA and PFOS at 4 parts per trillion — acknowledging the risk.
- Contaminated soil: Agricultural fields irrigated with PFAS-contaminated water or fertilized with biosolids (treated sewage sludge) accumulate PFAS. Plants take up PFAS from contaminated soil. Several farms in Maine, Michigan, and other states have been condemned after PFAS testing showed contamination in crops and milk.
- Seafood: Fish from PFAS-contaminated waterways accumulate these compounds, particularly in fatty tissues. Freshwater fish in contaminated areas can be significant sources.
Unlike BPA, PFAS accumulate in your body over time — they don't leave quickly. A single exposure matters less than chronic low-level exposure over years and decades. This makes reducing ongoing exposure more important than avoiding any single source.
What PFAS Do to Your Body
The health effects of PFAS — particularly the well-studied PFOA and PFOS — are documented through both epidemiological studies of exposed communities and laboratory research. A 2022 National Academies of Sciences report reviewed thousands of studies and classified health effects into three evidence categories:
Strong evidence of association:
- Kidney cancer and testicular cancer (PFOA linked most strongly)
- Elevated cholesterol (one of the most consistent findings)
- Thyroid disease and disrupted thyroid hormone levels
- Ulcerative colitis
- Reduced effectiveness of vaccines in children (immune system suppression)
- Pregnancy-induced hypertension and preeclampsia
Sufficient evidence of association:
- Reduced birth weight and low birth weight
- Breast cancer
- Ovarian cancer
- Liver damage (elevated liver enzymes)
- Reduced fertility in both men and women
Children are particularly vulnerable. Research shows PFAS exposure in utero and during early childhood affects immune function, development, and puberty timing. Children who received certain vaccines but had high PFAS exposure showed significantly reduced antibody levels — essentially, PFAS can undermine the effectiveness of childhood vaccinations.
The Regulatory Response (And Why It's Been Slow)
PFAS have been manufactured since the 1940s, and industry-funded research downplayed concerns for decades. Internal 3M documents revealed the company had evidence of PFAS health effects in the 1970s and continued manufacturing. DuPont's PFOA contamination of the Ohio River — the subject of the 2019 film "Dark Waters" — exposed entire communities to levels now known to cause cancer while executives were aware of the risks.
The EPA in 2024 finalized the first-ever national drinking water standards for PFAS, setting limits for PFOA and PFOS at 4 parts per trillion (ppt) — lower than any existing standards globally. The EU's PFAS regulations are also strengthening, with broad restrictions on PFAS in food contact materials proposed. But regulatory action on contamination already in the environment, food supply, and human bodies can only limit future exposure — it can't undo what's already accumulated.
The "New Generation" PFAS Problem
When PFOA and PFOS were phased out after regulatory pressure, manufacturers replaced them with GenX chemicals and other short-chain PFAS compounds. The industry argument: short-chain PFAS don't accumulate in the body as long. The emerging evidence: they may be just as toxic at lower concentrations, and in some ways more mobile in the environment, contaminating water supplies faster.
This is the same pattern we've seen with BPA → BPS, with trans fats → interesterified fats. The chemical being regulated changes; the underlying industrial logic doesn't. That's why broad food safety awareness matters more than tracking any single compound.
PFAS aren't listed on ingredient labels because they're not intentionally added ingredients — they're contaminants from packaging and environmental exposure. This is exactly why ingredient transparency tools need to go beyond labels to packaging and sourcing data.
How to Reduce Your PFAS Exposure
Complete avoidance isn't possible — PFAS are now global environmental pollutants. But meaningful reduction is achievable:
- Replace non-stick cookware: Switch to cast iron, stainless steel, or carbon steel. These require slightly different cooking technique but eliminate non-stick coating exposure entirely. Never heat non-stick pans to high temperatures or leave empty on a hot burner.
- Avoid fast food packaging: Eat out of containers instead of wrappers, or transfer food before eating. The direct contact between hot, greasy food and PFAS-treated packaging is the highest-risk scenario.
- Test your water: The EPA's PFAS monitoring program has found contaminated water in many municipalities. Use a certified water filter — NSF/ANSI Standard 53 or 58 filters (reverse osmosis or activated carbon) are effective against PFAS.
- Reduce microwave popcorn: The bags are heavily PFAS-treated; the hot steam carries PFAS into the food. Use an air popper or stovetop popping instead.
- Be cautious with food grown near military bases or industrial sites: If you live near a known PFAS contamination source, test your well water and consider where your local produce is grown.
- Choose fresh or frozen over packaged: Reducing overall packaged and fast food consumption reduces exposure across multiple vectors.
The Bottom Line
PFAS are a systemic, planetary-scale contamination problem that can't be solved by reading an ingredient label. They're in packaging, cookware, water, and soil. Their effects accumulate over a lifetime and are now documented in nearly every American's bloodstream.
That doesn't mean you're powerless. The steps above make a measurable difference. And the broader awareness that chemical safety in food goes beyond listed ingredients is exactly the kind of thinking that leads to better choices — and more pressure on regulators and manufacturers to act.
For the chemicals that are on labels, FoodPeel's ingredient database gives you instant ratings and plain-English explanations of what they are and what to do about them.