Milk has a high nutritional value, the benefits of drinking milk for middle-aged and elderly people, mainly for the body to supplement the required nutrients and provide a certain amount of energy. Milk is a natural beverage made from the milk of female cows that is properly sterilized and disinfected, and can generally be divided into whole milk, high calcium, low-fat and skim and other types. Milk has a high nutritional value, for example, every 100g of whole milk contains about 3.4g of carbohydrates, 3.2g of fat, 3g of protein, 104mg of calcium, 109mg of potassium and a few other trace elements and vitamins, which can provide the body with about 51kcal of energy. Milk can be used as a high quality source of protein, calcium and other nutrients for the body, and can be consumed in moderation by middle-aged and elderly people, with a recommended daily intake of 300ml of milk. However, those who are allergic to milk should also avoid drinking it.