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Dark chocolate - 170 calories for 1 ounce - Just one more reason to indulge: nosh on dark chocolate and you'll eat less at your next meal, according to research from the University of Copenhagen. Why? Compounds in chocolate slow down digestion and make you feel full longer. A small piece of chocolate (aim for the size of a business card) can also curb your cravings for salty, sweet, and fatty foods.