Vegetarianism is a long-standing food culture, and in the 1980s, vegetarians were still limited to Buddhists in China, but as the vegetarian movement has flourished, many vegetarians have emerged across the country who consider vegetarianism a healthy lifestyle. Many vegetarian herbivores believe that a vegetarian diet is healthy. Indeed, a sensible vegetarian diet is clearly beneficial in terms of common chronic diseases such as cardiovascular system diseases and cancer prevention. However, from the perspective of a nutritious diet, the following points should also be noted: 1. Vitamin B12 supplementation. Vitamin B12 is almost exclusively found in animal foods and is necessary for the hematopoietic process and the nervous system. Lack of vitamin B12 can make people feel sleepy, weak, constipated, lose weight, have problems with nerves and produce mental disorders, spinal cord degeneration, and can cause severe psychiatric symptoms. Severe deficiencies can even appear visual hallucinations and other phenomena. 2, supplementation of calcium, iron, zinc and other nutrients. Although these nutrients can also be obtained from plants, but the body’s absorption and utilization of these nutrients from plants is poor, the absorption rate is much lower than that obtained from animal foods, which means that the stock of these nutrients in the body of vegetarians is generally low. 3, supplementation of vitamin D. Vitamin D is mainly found in deep-sea fish and animal foods. Vitamin D deficiency can affect calcification, leading to rickets in children and chondromalacia in adults. Symptoms include bone and joint pain, muscle atrophy, insomnia, nervousness, and dysentery and diarrhea. In addition to this, vitamin D is also used to reduce the chances of colon, breast and prostate cancers, and has a strengthening effect on the immune system. 4.Supplement quality protein. The quality of protein intake of vegetarians is relatively low, and its utilization rate is even lower than that of animal protein. Long-term protein intake is not enough, will affect the body tissue protein synthesis, causing a decrease in metabolic rate, resistance to disease, susceptible to disease, damage to organs, common is the growth retardation of children, malnutrition, body quality decline, indifference, irritability, anemia, and dry lean disease or edema, and because of easy infection and secondary diseases. 5, eat more coarse grains. Should replace white rice and white flour with whole wheat bread, germ bread, potatoes, brown rice, etc. When eating vegetarian should choose diverse dishes, do not prefer several dishes, drink more milk or yogurt, eat more beans or soy products, consume more nuts such as cashews and almonds, not to make vegetarian food more flavorful and cook with more fat, should master the principle of vegetarian dishes light, less salt and less sugar.