Milk and dairy products are great sources of protein and calcium. They're good sources of protein and calcium as milk and dairy products form part of a healthy diet. Our bodies need protein to work properly and to grow or repair themselves. Calcium helps to keep our bones and teeth strong. The calcium in dairy foods is particularly good for us because our bodies absorb it easily. The total fat content of dairy products can vary a lot. Fat in milk provides calories and also contains essential vitamins such as vitamin B2 and vitamin B12.