Can BPA in plastics interact with genes to increase autism risk?

What's actually in it

Bisphenol A (BPA) is in canned food linings, polycarbonate plastics, thermal receipts, and water supply pipes. Everyone has some BPA in their blood. It mimics estrogen and can cross the placenta to reach the developing fetal brain. Not all children are equally vulnerable: genetics play a role in how the body processes and responds to BPA.

What the research says

A 2026 study in Autism Res investigated gene-environment interactions between BPA exposure and autism spectrum disorder (ASD). The researchers looked at whether certain genetic variants make some children more susceptible to BPA's effects on brain development.

They found that BPA interacts with specific genes involved in neurodevelopment. Children who carry certain genetic variants and are also exposed to higher BPA levels showed a greater risk of developing ASD traits. Children with the same genetic variants but lower BPA exposure didn't show the same risk.

This is a gene-environment interaction: neither the gene alone nor BPA alone is enough to cause autism. But the combination of genetic susceptibility and chemical exposure creates a higher risk than either factor would alone.

The study adds to evidence that reducing BPA exposure during pregnancy and early childhood could be especially important for families with a genetic predisposition to neurodevelopmental conditions. Choosing BPA-free canned foods, avoiding polycarbonate plastics, and declining paper receipts are simple ways to lower exposure.