Milk, along with its high protein content, is rich in calcium, which everyone's bones need to stay strong. As a great source of both protein and calcium, milk builds muscles and tissue. The carbohydrates in milk give individuals energy when they need it. It is rich in nutrients that keep all aspects of the body functioning well such as vitamin A, phosphorus, vitamin B, as well as vitamin D, which is a crucial vitamin individuals also receive from exposure to the sun. The fats in milk are essential fatty acids the body requires in moderation. Individuals can choose from a range of different kinds of milk, including homogenous milk, skim milk, one percent milk, and perhaps the most popular: two percent milk.