Are PFAS in pregnancy tied to thyroid changes in the mom?
The research indicates that PFAS exposure is a significant concern for thyroid health, with studies showing that these chemicals can disrupt thyroid function in both youth and during pregnancy.
What's actually in it
PFAS (per- and polyfluoroalkyl substances) are a group of man-made chemicals often called forever chemicals. They are used to make products resistant to water, grease, and stains. Because they don't break down, they build up in your body and the environment.
These chemicals are not just in your kitchen. They are found in human milk, as noted in a 2026 systematic review in Environ Res. When you are pregnant, these chemicals can cross the placenta, potentially impacting both your health and your baby's development.
What the research says
The link between these chemicals and thyroid health is backed by peer-reviewed research. A 2026 study in Environ Int followed youth over 10 years and found that long-term PFAS exposure is tied to changes in thyroid function trajectories. This suggests that the impact of these chemicals on your thyroid can be lasting.
Other research highlights the complexity of these risks. A 2026 study in Chem Biol Interact points out that even newer PFAS alternatives may carry novel or similar risks for health issues during pregnancy. While some studies focus on how metals and vitamin D levels modulate thyroid function, as seen in a 2026 study in Environ Int, the presence of persistent chemicals like PFAS remains a critical factor in understanding maternal and neonatal thyroid health.
The research at a glance
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