The nutritional components of fresh milk are mainly water, protein, carbohydrate, fat, lactose, vitamins, minerals and amino acids. The water content of fresh milk is about 80% to 90%, so the nutrient content of fresh milk is relatively low compared with other foods.
Milk powder is powder made from fresh milk after processing, which means that milk powder is concentrated fresh milk. Milk powder is divided into whole milk powder, skimmed milk powder and prepared milk powder. The nutrient content of whole milk powder is about eight times that of fresh milk. Skim milk powder will lose most of the fat-soluble vitamins because of its low fat content. Formulated milk powder is made according to the nutritional needs of different special groups, and its nutrient content may be more suitable for these groups, such as infant milk powder, elderly milk powder, pregnant milk powder and so on.