The main physiological function of colon is to absorb water and store food residues to form feces. When suffering from tumor, there can be symptoms such as diarrhea, difficult obstruction of defecation and general wasting. If the diet is still inattentive, eating some indigestible food and cancer-promoting food, it will aggravate the progress of colon cancer and make the whole body exhausted. Patients with colon cancer must pay attention to their daily diet. Scientific research proves that high-fat diet will promote the occurrence of intestinal tumors, especially polyunsaturated fatty acids, which can lower blood lipids but have a cancer-promoting effect. Cholesterol itself is not carcinogenic, but reacts with gallstone acid at the same time and has a cancer-promoting effect, indicating that gallstone acid is a cancer-promoting factor. Therefore, patients with colon cancer should not eat too much fat, that is, the daily fat intake should be less than 50 grams in a day’s meal, including the amount of fats in the food itself, plus the oil used in cooking. Because the carbon chain in vegetable oil is unstable and easy to oxidize, if you eat some animal fat properly, it will make the carbon chain stable and not easy to oxidize, and reduce the formation of free radicals in the body, so you must eat scientifically and pay attention to the reasonable ratio of fats and oils, it is recommended that the ratio of saturated fatty acids to polyunsaturated fatty acids and monounsaturated fatty acids is 1:1:1. Some patients are afraid of coronary heart disease, control animal fat very strictly, often to Some patients are afraid of coronary heart disease, control animal fat very strictly, often to vegetable oil mainly, or even do not eat animal oil, which will cause excessive peroxide in the body. Rectal cancer and colon cancer account for the majority of intestinal tumors. In the early stage of bowel cancer, there are often changes in stool, sometimes constipation, sometimes diarrhea, blood in stool, and some patients have alternating constipation and diarrhea. Therefore, patients with early stage bowel cancer should pay attention to stool regulation and eat more vegetables rich in dietary fiber, such as celery, leek, cabbage, radish and other green leafy vegetables, which can stimulate intestinal peristalsis, increase the number of bowel movements and absorb carcinogenic and toxic substances in the stool. However, the processing should be meticulous to avoid the stimulation of tumor parts by excessively rough food. Patients with advanced bowel cancer should control the intake of dietary fiber when the tumor bulges into the intestinal cavity or grows infiltratively, resulting in narrowing of the intestinal cavity and incomplete obstruction, because excessive intake of dietary fiber may cause complete intestinal obstruction. At this time, we should give millet porridge, thick lotus root powder soup, rice soup, congee, egg custard, tofu brain and other easily digestible, fine and soft foods that can reduce the stimulation of the intestinal tract and pass through the intestinal cavity more smoothly and semi-fluid. Prevent the occurrence of intestinal obstruction. Post-operative patients with colon cancer should follow medical prescriptions for diet, just like other patients with gastrointestinal surgery. After starting to eat, the diet should be thin and soft, and then increase other diets after the body gradually adapts to it. The food such as sugar, fat, protein, minerals and vitamins should be reasonably matched, and there should be cereals, lean meat, fish, eggs, milk, all kinds of vegetables and soy products every day. Pay attention to strengthen the care and diet nutrition after surgery to promote the patient’s body recovery. We should pay attention to spicy foods, such as chili and pepper, which have stimulating effect on the anus and must not be eaten by intestinal cancer patients.