No. 3. Cooked Corn

In its full form, cooked corn has a high amount of potassium, which is important for keeping our organs running smoothly. It's high in vitamin B6 and has the highest amount of protein of the grains on this list. Corn is considered both a vegetable and a grain, and while it ranks highly on this list, it doesn't fare as well compared to other vegetables because of its high caloric and carbohydrate content (though it only contains 0.5 grams of sugar).

Calories per half cup, cooked: 303