Dietary nutrition and health emphasize scientific catering. Adhere to the principle of balanced nutrition and scientific catering, that is, make reasonable selection and collocation according to the shape, structure, chemical composition, nutritional value and physical and chemical properties of food. The first is the quality of catering, the color, fragrance, taste and shape of catering; Secondly, the variety and quantity of nutrients in the catering, so that the nutritional components of each dish and different dishes in each meal can cooperate with each other to meet the physiological needs of consumers and achieve the purpose of reasonable nutrition. This method of catering can be called scientific catering. Food should be diversified, vegetarian, thick and thin. Protein, sugar, minerals and vitamins are foods that must be supplemented. Avoid partial eclipse or excessive intake of fat and sugar.