PFAS / Fluorinated Chemicals

PFAS are a huge family of synthetic chemicals (thousands of them) built around very strong carbon-fluorine bonds. That bond is what makes them slippery, water-repellent, and grease-proof — and also what makes them nearly impossible to break down. They're called 'forever chemicals' because they hang around in the environment and the body for years.

Because they're amazing at what they do. PFAS make pans non-stick, jackets waterproof, carpets stain-proof, pizza boxes grease-proof, and firefighting foam fast-acting on fuel fires. The trade-off is environmental persistence and accumulation in living things.

PFAS, PFOA, PFOS, PFNA, PFHxS, GenX, perfluorinated, polyfluoroalkyl, fluoropolymer, PTFE (Teflon), 'Scotchgard', 'Stainmaster', 'Gore-Tex'. Marketing language to watch: 'non-stick', 'stain-resistant', 'waterproof', 'water-repellent', 'grease-proof'.

Non-stick pans, waterproof rain gear, stain-resistant carpets and furniture, fast-food wrappers, microwave popcorn bags, bakery liners, some cosmetics, and many treated textiles. In contaminated regions it's also in tap water.

Main routes are drinking water (especially near affected industrial or military sites), food (from packaging, contaminated water used in farming, and fish from polluted waters), and household dust. Skin absorption is usually minor.

Higher PFAS exposure has been linked to pregnancy outcomes like preeclampsia and lower birth weight, and to changes in vaccine response in children whose mothers had higher levels during pregnancy. The body burden tends to accumulate, so reducing exposure before pregnancy matters more than after.

Some studies link higher PFAS levels to lower testosterone and changes in sperm quality. Effects are real but small at typical exposure for most people; bigger in heavily contaminated areas.

Concern is higher because PFAS pass through the placenta and into breast milk, and because kids drink more water per kilo than adults. Documented links include reduced vaccine effectiveness, changes in growth and development, and altered immune response.

Because PFAS accumulate over decades, older adults often have the highest body burdens. Some studies link higher levels to cardiovascular and cholesterol changes. Less acute concern than in pregnancy and childhood, but real.

Strongest evidence is for elevated cholesterol, reduced vaccine response in children, kidney and testicular cancer (PFOA), thyroid disease, and pregnancy-induced hypertension. IARC classified PFOA as carcinogenic to humans (Group 1) in 2023.

Daily-use risk depends massively on your drinking water. In contaminated regions, water is the dominant exposure source by far. Elsewhere, the cumulative risk from packaging and non-stick is real but lower-priority than other chemicals on this list.

Stainless steel, cast iron, enamelled cast iron, or carbon steel cookware (avoid scratched non-stick — that's when most release happens). Skip 'stain-protection' add-ons on furniture and carpets. Choose untreated textiles where possible. For water, use a filter certified to reduce PFAS (NSF/ANSI 53 or 58) if you're in an affected area.

Medium. Cookware swap is easy. Stain-resistant textiles are harder because the treatment isn't always disclosed. Drinking water is hardest — that's a systemic issue you'll usually need filtration to address.

If you have non-stick pans with visible scratches, replace them — that's when PFAS release jumps. Stainless steel and cast iron are durable and cheap long-term. While you're at it, check whether your local water utility publishes PFAS test results.

PFAS are a real long-term issue, but the lever you control most easily at home is cookware and food packaging. Water is the bigger systemic issue — worth knowing your local situation and filtering if needed. This is one to take seriously without panicking.

EPA on PFAS in drinking water, FDA on PFAS in food contact, NIEHS on PFAS health effects, ECHA on EU restriction proposals. See References below.