The theory of TCM health preservation puts forward these requirements for food: first, there are many kinds of food in the comprehensive diet, which contain different nutritional components. Only by reasonable collocation can we ensure all kinds of nutrients needed by human normal life activities. Huangdi Neijing pointed out that "five grains are the nourishment, five fruits are the main ones, five animals are the benefits, five dishes are the fillings, and the smell is harmonious to supplement the essence." Put forward the principle of food diversification. Second, reasonable collocation: 1, to reconcile the five flavors. Chinese medicine divides food into sweet, sour, bitter, salty and light. These five flavors are closely related to the physiological instinct of the five internal organs and have different effects on the human body. Acid enters the liver, bitter enters the heart, sweet enters the spleen, pungent enters the lung and salty enters the kidney. How to harmonize the five flavors to benefit the qi of the five internal organs and enhance physical fitness? 2. Proper cold and hot means that the food is cool, hot and cold on the one hand, and the temperature of the food should be appropriate on the other hand, and it is not suitable for direct consumption if it is overheated or supercooled; 3 meat and vegetable collocation. Meat contains high-quality protein, and protein contains vitamin B 12 and other nutrients that are not found in vegetarian food. Moreover, the combination of meat and vegetables can also achieve nutritional complementarity; 4, the thickness is matched. Is to eat all kinds of miscellaneous grains, so that there is nutrition; Third, the experiment is based on diet. According to the theory of traditional Chinese medicine, a scientific diet should maintain a dynamic balance under the guidance of the concept of "harmony between man and nature". Diet must be treated differently according to the specific situation, and flexible diet should be achieved according to the different principles of people, time, place and illness. Fourth, eat moderately. Diet must be regular, quantitative and full. Eat well for breakfast, eat well for lunch and eat less for dinner; 5. Food hygiene. Fresh and clean diet, mainly cooked food, diet taboo. Chinese medicine believes that "the taste of eating is suitable for the disease and harmful to the body." Appropriate is complementary, and harm is a disease. " In short, people with cold syndrome should be careful to eat cold and cool products, people with heat syndrome should be careful to eat spicy products, and people with weak spleen and stomach should be careful to eat sticky products.