Dietary nutrition and health emphasize scientific catering. Adhering to the principle of balanced nutrition and scientific catering means reasonable selection and matching 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 nutritional ingredients in the catering, so that the nutritional ingredients 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, food elements should be thick and thin. Protein, sugar, minerals and vitamins are foods that must be supplemented. Avoid partial eclipse or excessive intake of fat and sugar.