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12 Foods That Make You Smarter

Eat More: Dark Chocolate

Eat More: Dark Chocolate

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

By Michael Gonzalez-Wallace. Published September 13, 2011. Gonzalez-Wallace is the author of Super Body, Super Brain and is MedHelp’s Brain and Body Fitness expert.