Flavonoids are a class of water-soluble plant pigments. Flavonoids are broken down into categories, though the issue of how to divide them is not universally agreed upon. One system breaks flavonoids into isoflavones, anthocyanidins, flavones, flavonols, flavones, and flavanones. Some of the best-known flavonoids, such as genistein in soy, and quercetin in onions, can be considered subcategories of categories.
