Disease has two basic causes: nutritional deficiency and toxicity. We’ve talked a lot about strengthening immunity with nutrients like vitamins A, C and D; minerals like zinc and selenium; and fats like the omega-3 fatty acids. But protecting your cellular machinery from toxins that gum up the works is just as important.A case in point is a group of toxic, man-made chemicals called PFAS (per- and profluoroalkyls), the best-known of which, PFOA (perfluorooctanoic acid), is the key ingredient in Teflon-coated pots and pans. But PFAS have many other applications and are used in a variety of non-stick, stain-resistant and water-repellent coatings in everything from rugs and upholstery to pizza cartons and dental floss. PFAS are harmful to nearly every human organ and cause or contribute to all kinds of disease. Arthritis, cancer, asthma, allergies, hormone abnormalities—particularly reproductive and thyroid issues, obesity, high blood pressure, increased cholesterol, heart disease, liver…