Can PFAS chemicals from nonstick pans affect your thyroid?

What's actually in it

PFAS (per- and polyfluoroalkyl substances) are the chemicals that give nonstick pans their slick coating. They're also found in stain-resistant fabrics, grease-proof food wrappers, and some cleaning products. These "forever chemicals" don't break down easily, so they build up in your body over time.

Your thyroid is a small gland in your neck that controls your metabolism, energy levels, and mood. It's very sensitive to chemical interference, which is why PFAS exposure is a concern.

What the research says

A 2026 study in Toxicol Sci tested how PFAS affect the thyroid using both cell cultures and live animals. The researchers found that PFAS changed the physical structure of thyroid tissue. Cells that should be neatly organized became disordered and swollen.

PFAS also disrupted thyroid hormone signaling at the cellular level. The chemicals interfered with the pathways thyroid cells use to make and release hormones like T3 and T4. These hormones control how fast you burn calories, how warm you feel, and even how clearly you think.

The study tested these effects both in a lab dish and in living animals, and the results matched. That two-way confirmation makes the findings stronger than either test alone.

People who cook with nonstick pans daily, especially at high heat or with scratched coatings, take in more PFAS than those who use stainless steel or cast iron. If you've noticed unexplained tiredness, weight changes, or brain fog, your cookware might be worth a second look.