Some scientific studies suggest that certain PFAS may affect different systems in the body. More research is needed to understand, with certainty, if or how, exposure to PFAS in our water and food can affect people’s health.
- Scientists have studied lab animals exposed to high amounts of PFAS and have shown changes in the way their liver, thyroid, and pancreas work, as well as some changes in hormone levels. Because chemicals do not always affect animals and people the same way, scientists estimate how the exposure and effects in animals compare to what they would be in people.
- Some (but not all) PFAS build up in the human body. The levels of PFAS go down slowly over time once exposure stops. Scientists are studying how different amounts of PFAS in the body over time may affect human health.
- Again, more research is needed, but some studies in humans have shown that certain PFAS may:
- Increased cholesterol levels;
- Decrease in response from the body to some vaccines (immune system);
- Increased risk of thyroid disease;
- Decreased fertility in women;
- Increase in the risk of high blood pressure or pre-eclampsia in pregnant women; or
- Lower infant birth weights.
- Increase the risk of some cancers
· At this time, scientists are still learning about the health effects of exposures to mixtures of PFAS.