Milk is one of the oldest natural drinks, known as "white blood", and its importance to human body can be imagined. As the name suggests, milk is squeezed from female cows. In different countries, milk also has different grades.

Milk is rich in minerals, calcium, phosphorus, iron, zinc, copper, manganese and molybdenum. The most rare thing is that milk is the best source of calcium for human body, and the ratio of calcium to phosphorus is very appropriate, which is beneficial to the absorption of calcium. The species are complex, at least 100. The main components are water, fat, phospholipids, protein, lactose and inorganic salts.

Milk has a calming effect on human body. People will feel a sense of calm after eating milk, so drinking a glass of milk at night before going to bed will play a role in calming the nerves and promoting sleep. Milk can cure gastric and duodenal ulcer diseases. Milk also has anti-gastric cancer function. Milk and fermented yogurt can reduce cancer. Among carcinogens, 85% are mutagenic, so drinking milk or yogurt often has cancer prevention effect.

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Milk is called a completely nutritious food, and its nutritional value can be almost completely digested and absorbed, and there is no waste. Contains all essential amino acids for human body. The proportion of calcium and phosphorus in milk is appropriate, which is an ideal nutritious food to promote the development of bones and teeth of children and adolescents. Minerals are an important component of the body, which can maintain the osmotic pressure inside and outside the cell together with protein, and can also regulate the excitability of neuromuscular.