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Because so many consumer products contain PFAS, most people have had exposure to them. Studies about the health effects on people are inconclusive. Some, but not all, studies on long-term exposure show these chemicals may: Increase cholesterol levels.Increase uric acid level—a precursor for cardiovascular disease.Affect the fetus development and childhood learning and behavior.Increase some types of cancers: prostate, kidney, and testicular cancer.Decrease fertility and interfere with the body’s natural hormones.Affect the immune system—reduced immune responses to vaccines in children. Much of what we know about the health effects comes from a large study of more than 69,000 people exposed over several decades in Ohio and West Virginia.