According to traditional Chinese medicine, the spleen and stomach are the foundation of the body. Food must be cooked by the stomach and transported by the spleen before it can reach the whole body. If we eat too much fatty, sweet and thick food, on the one hand, it will be difficult for the spleen to transport and transform, on the other hand, it will hurt the spleen and stomach and cause dampness, heat and toxicity, which will accumulate in the intestines and cause cancer over time. High-fat and high-protein food can increase methylcholanthrene in the stool, causing increased secretion of bile acid, which is broken down by anaerobic bacteria in the intestine into unsaturated polyhydrocarbons, both of which are carcinogenic substances. At the same time, if the fiber in food is reduced, the speed of feces passing through the intestine is slowed down, which increases the contact time between these carcinogenic substances and intestinal conjunctiva and leads to more chances of carcinogenesis, thus contributing to the occurrence of colorectal cancer. Therefore, these diseases are “eaten out” and “stay out”. We do not want to be “too extravagant”, we want to be truly happy. We advocate a simple life, neither advocate just big fish and meat, nor encourage vegetarianism, a reasonable diet is the guarantee of human health. Research shows that: carotene, vitamin B2, vitamin C and vitamin E can reduce the relative risk of colorectal cancer, while vitamin D, calcium, onion and garlic foods have a protective effect on the human body. On the other hand, it is necessary to exercise properly to mobilize the body’s yang energy and make the body strong in order to better prevent the occurrence of cancer.