A crucial ingredient in the diets of the world's heart-healthiest populations-like those Bordeaux-guzzling French-red wine has long been known to have potent anti-cancer and artery-protecting benefits. The key, some studies indicate, is an antioxidant found specifically in the skin of red wine grapes, called resveratrol. The latest studies even link resveratrol to greater endurance, a reduction in gum disease and Alzheimer's. White wine, which is fermented after the skins are removed, is less beneficial according to some studies.