Flavonoids are a family of some 5,000 plant compounds having a common chemical structure called polyphenol. Flavonoids can be divided into chemically-related subclasses of polyphenols called isoflavones (found in soy products), flavanones (like naringenin from citrus fruits), flavanols (e.g., catechins from tea or cocoa), flavonols (e.g., quercetin from many fruits and vegetables), and anthocyanidins (from [...]