"The darker, the better" has been the mantra with antioxidant-rich fruits. But new research out of Texas A&M University suggests that yellow-fleshed plums may be just as packed with free-radical-fighting powers as red-fleshed varieties. In fact, all plums (which are in season now) are as antioxidant-dense as blueberries, which means they're impressive allies in heart-disease and cancer prevention. What's more, in vitro tests suggest that they may also reduce the prospect of clogged arteries and inhibit the proliferation of certain breast-cancer cells. For an extra antioxidant boost, slice and sprinkle with cinnamon.