The widespread environmental contaminants known as PFAS cause multiple health problems in people, according to Linda Birnbaum, who retired as director of the National Institute of Environmental Health Sciences and the National Toxicology Program earlier this month.

The statement may come as little surprise to those following the medical literature on the industrial chemicals that have been used to make nonstick coatings, firefighting foam, and host of other products. Thousands of scholarly articles have linked the chemicals to at least 800 health effects. Some of the health problems found in humans — including elevated cholesterol levels, liver dysfunction, weight gain, reproductive problems and kidney cancer — have been shown to increase along with the levels of the chemicals in blood. Extensive research also shows that children with higher levels of PFAS have weakened immune responses.