Pure milk as a drink may cause gastrointestinal discomfort if consumed in excess. Moderate consumption of milk can provide the body with protein and other nutrients. The main components of pure milk are carbohydrates, fat and protein. The carbohydrate content of pure milk is 3.4g/100g, which can be used as a better food source of carbohydrates. And the protein content is 3g/100g, which is higher than the content percentage of most similar foods, making it a better food source of protein. In terms of minerals, pure milk has a calcium content of 104mg/100g, making it a good choice as a dietary calcium supplement. It should be noted that despite the high nutritional value of pure milk, long-term overconsumption may cause a burden on the stomach and intestines. At the same time, attention should be paid to dietary matching, and can be eaten with vegetable foods (such as cauliflower, lettuce, cabbage, etc.) to achieve the purpose of balanced nutrition. Those who are allergic to milk should not drink pure milk, and those who are lactose intolerant can drink lactose-free milk, comfort milk or yogurt.