Protein, fat, carbohydrates, vitamins, minerals, water and cellulose, the seven nutrients needed by the human body, all come from our daily diet. Only comprehensive, sufficient and balanced nutrition is the basis of healthy growth and development of human body. How to scientifically obtain comprehensive, sufficient and balanced nutrition in one day, there are several basic principles:

1, food diversification, mainly grain;

2. Eat more fruits, vegetables and potatoes;

3, often eat milk, beans and soy products;

4. Eat fish, poultry, eggs and lean meat in moderation, and eat less fat and fried food;

5, light and less salt

Therefore, if breakfast (must be eaten) and lunch can meet the above conditions, and there are enough quantities to meet the needs of physical activity, dinner can be eaten less or even not. Because we consume less physical energy after meals, it is not easy to eat more. So there is a healthy saying that "eat well early, eat well at noon and eat less at night".