Milk is one of the oldest natural beverages and is known as "white blood", which is important for the human body. Milk, as the name suggests, is milked from female cows. In different countries, there are different grades of milk.

Milk is rich in minerals, calcium, phosphorus, iron, zinc, copper, manganese and molybdenum. The most rare is that milk is the body's best source of calcium, and calcium and phosphorus ratio is very appropriate for calcium absorption. The variety is complex, there are at least 100 kinds of, the main ingredients are water, fat, phospholipids, protein, lactose, inorganic salts and so on.

Milk has a calming and tranquilizing effect on the human body. People will feel a sense of calm after eating milk, so a glass of milk before going to bed at night will play a tranquilizing role in promoting sleep. Milk can treat gastric and duodenal ulcer disease healing. Milk also has the function of anti-stomach cancer. Milk and fermented sour milk can reduce cancer. In carcinogenic substances in 85% of the mutagenic mechanism, so, often drink milk or yogurt has cancer prevention.

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Milk has been called a completely nutritious food, containing nutrients that can be digested and absorbed in their entirety, with no wasted