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Blueberries (and other berries such as raspberries and blackberries) are an excellent source of vitamin C, which helps protect cells against damage and helps in the absorption of iron. They also contain a decent amount of soluble fiber, which slows down the rate at which sugar is released into the bloodstream and helps to keep the digestive system happy. One cup of blueberries provides 24 percent of a person recommended daily allowance of vitamin C.