Milk gives calcium to our body which is necessary for our bones.
People who have a diet rich in milk and milk products can reduce the risk of low bone mass throughout the life cycle. Foods in the milk group provide vital nutrients, including calcium, potassium, vitamin D, and protein.

Build Stronger Bones
Diets rich in milk and milk products help build and maintain bone mass. This may reduce the risk of the bone-thinning disease osteoporosis.
Milk products are especially important to bone health during childhood and adolescence, when bone mass is being built.
Diets that include milk products tend to have a higher overall nutritional quality.
Calcium-fortified foods and drinks such as soy beverages or orange juice are other sources of calcium but may not provide other necessary nutrients.
Vitamins and Minerals
Calcium helps build stronger bones and teeth. Milk products are the primary source of calcium in American diets. Diets that provide 3 cups or the equivalent of milk products per day can improve bone mass. Diets rich in potassium may help to maintain healthy blood pressure. Milk products, especially yogurt and milk, provide potassium.
Vitamin D functions in the body to maintain proper levels of calcium and phosphorous, thereby helping to build and maintain bones. Milk that is fortified with vitamin D is a good source of this nutrient. Other sources include vitamin D-fortified yogurt and vitamin D-fortified ready-to-eat breakfast cereals.
Low-fat or fat-free milk products provide little or no fat.