White beans are rich in both dietary fiber and potassium. Also called cannellini beans, a single cup of it can provide you with as much as 1000 mg of the mineral. That’s the highest concentration you can find on any food. However, boiling the low-glycemic legume will drop the amount a little. The nutritional profile of this bean is pretty impressive. It has magnesium, antioxidants, and can even inhibit the storage of energy as fat.