How do 'forever chemicals' speed biological aging?
New study links two PFAS to faster epigenetic aging
Researchers have identified a connection between exposure to specific per‑ and polyfluoroalkyl substances (PFAS) and a faster biological aging process measured at the epigenetic level. The chemicals implicated are PFNA (perfluorononanoic acid) and PFOSA, a precursor of PFOA. The study found that people with higher levels of these compounds showed signs of accelerated epigenetic aging, with the association most pronounced in middle‑aged men.
Scientists measured epigenetic aging using DNA methylation patterns—molecular marks that tend to change as people grow older and that can be combined into an index of biological age. Individuals with elevated PFNA and PFOSA had epigenetic clocks that ran faster than their chronological age, a signal that tissues may be aging more quickly. This type of biological aging has been linked in other work to higher risks of chronic disease and earlier mortality.
Why it matters
- PFAS are widespread and persistent in the environment and human bodies.
- PFNA and PFOSA are not the only PFAS, but the study highlights particular compounds that may be especially harmful.
- Accelerated epigenetic aging could help explain links between PFAS exposure and increased risk of age‑related diseases.
What we still don’t know
It’s still unclear whether the PFAS exposures directly cause the faster epigenetic aging or whether other factors tied to exposure are involved. The mechanisms by which these chemicals might alter DNA methylation remain to be worked out, and researchers caution that more studies—especially those that follow people over time—are needed to confirm causality and to see whether reducing exposures slows biological ageing.
The public‑health takeaway is that some PFAS compounds may do more than persist in bodies: they could be nudging the molecular clocks that underlie aging and disease, reinforcing calls for tighter controls and more research into remediation and safer chemical alternatives.