A bottle of 250ml pure milk can generate about 160 kcal of heat. The content of protein in milk is relatively constant, about 3.0%. Mainly containing casein and whey protein, it belongs to high-quality protein and is easy to be digested and absorbed by human body. The fat content is 2.8%-4.0%. Carbohydrate accounts for 3.4%-7.4%. Milk is rich in minerals and vitamins. The fat content of low-fat or skim milk is low, and the calories will be reduced accordingly.

Milk contains nutrients necessary for human growth, development and metabolism, almost all of which can be digested and absorbed by human body, so it is called completely nutritious food. The World Health Organization also lists per capita dairy as the main index to measure the living standard of a country's people.

A person who drinks two cups of milk every day, that is, 500ml, can get high-quality protein 16.5g, fat 17.5g, sugar 22.5g, calcium 600mg, vitamin B20.8 international unit, vitamin D 10 international unit, and vitamin B10.5mg.