This document discusses different types of toxins, including intrinsic and extrinsic toxins. It defines a toxin as a poisonous substance produced by living cells or organisms. Toxins can be small molecules, peptides, or proteins that interact with biological molecules and cause disease. The document categorizes several types of intrinsic toxins found in plants, such as goitrogens, tannins, phytoestrogens, and phytates. It also discusses several heavy metals and chemicals that are extrinsic toxins, examining their sources and health effects. Finally, it outlines some toxins found in processed foods and recommends avoiding aluminum cookware, plastic food storage, and nitrates in preserved meats to reduce toxin exposure.