Nutrients generally include carbohydrates, protein, fat, vitamins, minerals, water and dietary fiber. 1. Carbohydrates: carbohydrates are mainly derived from starch-containing substances, such as rice, millet, noodles, steamed bread, corn, wheat, etc. The proportion of carbohydrates in the body’s total calories can be up to about 60%. 2. Protein: Protein usually comes from animal protein and plant protein. Animal protein refers to a variety of meat products, milk and eggs. Plant proteins include tofu, soy milk, peanuts and nuts. Protein food accounts for about 15% of the total calories in the body. 3. Fat: Fat mainly comes from animal offal and various oils and fats, accounting for about 25% of the human body. 4. Vitamins: such as vitamin C, vitamin A, B vitamins, vitamins involved in the body’s metabolism of a variety of nutrients, to maintain normal blood vessels, vision, metabolism and other physiological functions is very important, mainly in vegetables and fruits. 5. Minerals: such as potassium, iron, magnesium, calcium, etc., is essential to the body, with the maintenance of the body’s electrolyte balance of the physiological role of the main vegetables and fruits, meat, eggs and other most of the food. 6. Water: Although water does not provide the energy needed by the body, but has the role of maintaining body temperature, but the human body to maintain life activities is one of the indispensable substances. 7. Dietary fiber: dietary fiber is a food source of probiotics, mainly to help the formation of feces and promote gastrointestinal peristalsis, mainly found in fruits and vegetables. It is also necessary to maintain a balanced diet in order to supplement the full range of nutrients.