Whole oats are oats that still contain their endosperm, bran and germ. Whole oats are an excellent source of fiber, protein and vitamins. Studies have shown that whole oats have a specific kind of fiber referred to as beta-glucan, which has shown to be especially effective in lowering cholesterol. Whole grain oats contain seven vitamins, including vitamin E and a host of nutrients, including iron and calcium. Oats have twice the amount of protein than whole wheat or whole corn.