2. A Banana a Day Potassium helps reduce bloating and bananas are high in potassium, so eat one every day. “When potassium is low, the body retains extra sodium and holds on to water,” says Joy Bauer, RD. If you’re not crazy about bananas (who are you?) other potassium-rich foods are tomatoes, mushrooms, dark leafy greens, and fish including salmon and halibut.