Blueberries

The deep blue of these berries does more than make a pretty pie. The color comes from potent compounds called anthocyanins. Scientists think these antioxidants may help protect you from cancer, heart disease, and dementia, and boost your immune system. But we need more research to know for sure. Eat these juicy gems fresh or frozen. They have water and fiber, which fill you up without wrecking your diet. A half-cup has about 40 calories.

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