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Chocoholics rejoice: In the right dose, dark chocolate sharpens concentration and reaction time (it's a natural stimulant) and its powerful antioxidant properties increase the production of feel-good endorphins. Eating small amounts of dark chocolate each week reduced the risk of stroke by 22 percent, in one recent study. The trick to continued, guilt-free enjoyment: Eat dark chocolate with less than 10 grams of sugar per serving.
Enjoy: 1 to 2 one-ounce pieces, 4 times a week