1, milk is easy to absorb and can enhance nutrition. Milk is a very old natural food. Since ancient times, people in western countries like to drink milk, so the physical quality of westerners is generally better than that of people in other countries. Later, Japan also attached great importance to the role of milk and began to provide free milk to primary and secondary school students, and the overall height of the Japanese people was also improved. Milk contains almost all nutrients except dietary fiber, and it is the only total nutrient, such as high-quality protein, fat, minerals, vitamins and lactose. More importantly, the 25 amino acids provided by milk protein are closest to human tissues and can be completely absorbed by the human body, which is unmatched by other foods.

2。 Children are in the period of growth and development. Drinking milk can supplement calcium and promote children's development. The dietary structure of Chinese residents is mainly plant food, and the milk intake is obviously insufficient, which leads to insufficient calcium intake and the overall physical fitness of the people is relatively poor. Milk has high calcium content and high absorption rate, and calcium is an indispensable nutrient to ensure the normal development of bones in primary and secondary schools. If calcium is deficient, it will lead to skeletal dysplasia, affect the height, and also affect the bone density in adulthood, causing osteoporosis and fractures. To prevent these diseases and improve bone mineral density, we should start from childhood, especially adolescence with rapid growth and development. Therefore, the primary and secondary school students' stage is the best time to supplement calcium, and milk is the best food to strengthen the body and bones.