;Explore the impact of vegetarianism on human health, animal life, environment, and disease. Global warming has caused the deterioration of the living environment and caused human suffering. After long-term research by scientists, it has been found that vegetarianism can slow down global warming, vegetarianism can also bring hope to the earth. This paper takes vegetarianism as a starting point. Why support vegetarianism? From the perspective of preventive medicine, medical and nutritional diet research, why meat, milk and eggs are the main cause of cancer diseases? Vegetarian diet can reduce disease and improve health condition. Vegetarianism is definitely beneficial to people′s body and mind. Vegetarianism is a trend, and diet is not violent and purifies the body. Through the study of the thoughts of " The Yi Jing ", find the wisdom of food and the value of life.