In recent years, with the development of society, people’s living standard is getting higher and higher, but diseases are never far away from us, especially colorectal cancer, which has an increasing trend in recent years. The incidence of colorectal cancer accounts for about 12%-15% of the whole body malignant tumors. The factors that can easily cause colorectal cancer in life are also relatively large, let’s learn more about them below. The incidence of colorectal cancer has a lot to do with dietary habits. Long-term consumption of high-fat, high-protein and low-fiber foods, together with mental tension, excessive stress and reduced exercise are all high-risk factors leading to the occurrence of cancer. Among the causes of colorectal cancer, diet and environmental factors are more important than those of heredity and race; they are obviously related to the different contents of fat in people’s diet, and those whose diet is rich in fiber have a lower incidence of colorectal cancer. In modern society, the living habits of some young bosses or white-collar workers are not so healthy, they either forget to eat or drink a lot of alcohol and smoke for the sake of work, and the mental pressure is relatively high and the amount of exercise is reduced, which directly leads to the high incidence of colorectal cancer among young people in China. The higher the intake of high calories, animal fat and cholesterol in the diet, and the obvious lack of fiber and vitamins, the greater the risk of dissolving and absorbing carcinogenic substances. High-fat diet can increase the secretion of bile acids in the intestine, which can potentially irritate and damage the mucosa of the latter tract. The lack of carcinogen diluting fiber, in turn, tends to increase the concentration of carcinogens after metabolism. If in such stimulation and damage for a long time, it may induce the production of tumor cells and lead to colorectal cancer. Deep-fried, fried and baked foods, pickled products contain carcinogens and certain other micronutrient deficiencies also increase the incidence of colorectal cancer. Greasy diet can increase the concentration of bile acids and neutral sterols in the colon, change the composition of colonic flora and gradually form carcinogenic substances in the intestine. Food additives, meat and fish treated with nitrite (such as salted meat, ham, salted fish, etc.) and some drugs (such as piramiphos, lisinopril, oxytetracycline, etc.) also have carcinogenic substances. To prevent colon cancer, we should eat less or no foods rich in saturated fat and cholesterol, including: lard, butter, fatty meat, animal offal, fish roe, etc.; limit vegetable oil to about 20-30 grams per person per day (about 2-3 tablespoons); eat no or less fried foods; eat foods containing unsaturated fatty acids in moderation, such as olive oil, tuna, etc.; supplement dietary fiber with more than 35 grams per day; eat more foods rich in dietary Fiber-rich foods, such as konjac, soybeans and their products, fresh vegetables and fruits, algae, etc.; eat more fresh vegetables and fruits to supplement carotene and vitamin c; eat walnuts, peanuts, dairy products, seafood, etc. in moderation to supplement vitamin e; pay attention to the intake of malt, fish, mushrooms and other foods rich in trace elements selenium. We should also do a good job of prevention in life, rationalize the daily diet, eat more fresh fruits, vegetables and other foods rich in carbohydrates and coarse fibers, and appropriately increase the proportion of coarse grains and mixed grains in the main diet, not too fine and too refined. Change the habit of meat and high-protein food as the main food. Eat less high-fat food, especially to control the intake of animal fat. Therefore, the carcinogenic substances produced by high-fat, high-protein and low-fiber diet are more and act on the large intestine for a long time, which will certainly lead to an increase in the incidence of colorectal cancer. At the same time, actively prevent and control intestinal diseases and exercise. Prevention of various polyps, chronic enteritis (including ulcerative colitis), schistosomiasis, chronic dysentery, etc., for intestinal polyps should be dealt with more early. In addition, habitual constipation should be actively treated and attention should be paid to keep the bowels open. Warm tip: People with high risk of colorectal cancer, such as men over 40 years old, patients with familial polyps, ulcerative colitis, chronic schistosomiasis and people with family history of colorectal cancer should have regular checkups and be alert to the warning signs and early symptoms of colorectal cancer, such as change in stool habit, alternating diarrhea and constipation, blood in stool or black stool, flattening and thinning of stool shape, etc.