Beans (all forms)

Consumed most commonly in their whole forms, beans are a good source of B vitamins, potassium, and fiber, which promotes digestive health and relieves constipation. Some studies say that eating means may help prevent colon cancer, and lower blood cholesterol. One serving (1/3 cup) contains just 80 calories, no cholesterol, and little fat, but packs a punch in the complex carbs category.