Research has suggested that 98 percent of Americans contain trace levels of PFCs (perfluorocarbons), chemicals that are used to repel water, grease and stains and are found in nonstick cookware, clothing, carpeting, furniture and food containers. Our bodies absorb PFCs through food, our skin and via fumes from overheated pans. They’re linked with liver damage, developmental problems, cancer and, according to one 2011 study in the Journal of Clinical Endocrinology & Metabolism, early menopause.