PFAS chemicals are made up of a chain of linked carbon and fluorine atoms, which do not degrade in the environment.
A 2015 CDC report found endocrine-disrupting PFAS have been detected in the blood of 97% of Americans.
According to CNN, they're used in all sorts of consumer products, including fast food packaging.
Foods that contain a lot of grease -- such as burgers, fries, and cookies -- are prime candidates for wrappers made with PFAS.