Can PFAS exposure from household products affect memory and cognitive function as you age?
Possibly. Higher PFAS blood levels are associated with worse cognitive function, particularly memory, in adults. The association strengthens with age as PFAS accumulate and cognitive reserves decline.
What's actually in it
PFAS build up over a lifetime of exposure from nonstick cookware, food packaging, stain-resistant products, and contaminated water. Unlike chemicals that clear from the body quickly, PFAS persist for years in blood and organs including the brain.
PFAS cross the blood-brain barrier and have been found in human brain tissue. They disrupt multiple neurological processes: thyroid hormone signaling (critical for brain function), neuroinflammation, and mitochondrial function in brain cells.
What the research says
A 2026 study on PFAS exposure and cognitive function found that adults with higher serum PFAS levels performed worse on tests of memory, processing speed, and executive function. The associations were dose-related and were found across multiple PFAS compounds. Older adults showed stronger associations, suggesting accumulation over decades compounds the cognitive impact.
The potential mechanisms include PFAS-induced neuroinflammation, thyroid hormone disruption (which affects neurotransmitter levels), and oxidative stress in brain cells. All three have established connections to cognitive aging and dementia risk.
While PFAS body burden declines slowly over years after exposure stops, reducing ongoing exposure by removing nonstick cookware, filtering water, and avoiding PFAS-treated products slows the rate of accumulation.
The research at a glance
| Study | Journal | Year |
|---|---|---|
| Association of per- and polyfluoroalkyl substances (PFAS) exposure with cognitive function | Environ Health Perspect | 2026 |
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