The human body needs seven kinds of nutrients: minerals, lipids, protein, vitamins, carbohydrates, water and dietary fiber. Seven nutrients can play three physiological roles in human body: First, as energy substances (mainly protein, carbohydrates and lipids), they can supply the energy needed by human body; The second is as a "building" material for the human body. The energy needed to supply the human body is mainly protein; Thirdly, as a regulating substance, it regulates the physiological functions of human body, mainly including vitamins, minerals and dietary fiber. These nutrients are distributed in various foods and can be obtained as long as they can be widely eaten. The seven nutrients include: 1. Protein II. Lipid 3. Carbohydrate 4. Vitamin 5. Minerals. Water 7. Crude fiber (dietary fiber).