Dietary balance refers to the ideal diet of human beings, and it is also an important long-term goal of nutrition science. Except that babies from birth to six months can get a balanced diet through breastfeeding, it can be said that no single food can be called a balanced diet for human beings, and only a variety of foods can be matched with each other to form a balanced diet in real life. Theoretically, people's diet is required to satisfy both physiological appetite and physical and psychological material needs, so it is a balanced diet. With the development of nutrition science, the connotation of balanced diet is constantly enriched and developed.

People's daily demand for grain, bread, vegetables and fruits has greatly increased, while the demand for dairy products and meat has greatly decreased. The contents are as follows: cereals and refined nutritious cereal products, bread, hot or cold cereals, pasta and rice: 6- 1 1 serving a day. 1 is equivalent to 1 slice of bread or half a cup of rice. Vegetables: dark green leafy vegetables, yellow or orange vegetables: 3 ~ 5 servings a day. 1 serving is equivalent to 1 cup leafy vegetables (4 large leaves) or 6 ounces of vegetable juice. Fruits: citrus fruits, tomatoes or other fruits rich in vitamin C: 2-4 servings per day. One serving is equivalent to/kloc-0 per medium-sized fruit or 6 ounces of fresh juice. Dairy products: milk, cheese, yogurt and other dairy products: 2-3 servings per day. One serving is equivalent to a cup of yogurt or milk or 1 oz cheese. Beef, veal, pork, mutton, fish, chicken, animal liver, eggs and meat substitutes: 2-3 servings per day. One serving is equivalent to 3-4 ounces of animal protein, generally about the size of a deck of cards, or 1/4 cups of nuts. Use less fat, oil and sugar. According to the recommended amount formulated by the National Research Council, you can supply 1200 calories a day. However, the amount of "each person" should be appropriately adjusted according to the age, weight and energy required by the individual.