After rectal cancer surgery, pay attention to eating liquid food, and after recovery, consume more high-protein and high-vitamin foods that are easy to digest. Forbid to eat spicy and stimulating food. It is better to have a light diet and not to eat very greasy food. Early after rectal surgery, patients will experience disorders of intestinal function, most commonly diarrhea, followed by constipation. Generally, it is obviously relieved after 3 to 6 months after surgery, and no special treatment is needed. For those with frequent diarrhea, consider symptomatic treatment such as antidiarrhealin. The diet after intestinal resection is low-fiber, low-lactose, low-fat and high-protein diet. Increase the amount of fiber after the intestinal function is restored. If diarrhea occurs after surgery, avoid high lactose including rice, bananas, applesauce, and fruit juices. Those with constipation should increase the amount of fiber, eat more fruits, vegetables, cereals, fruit juices, and vitamin B12 after surgery. Supplement the body: pigeon, quail, and black fish into a thick soup with some sliced ham. 1. Reduce the intake of fats and oils in the diet: the relationship between diet and cancer, among which the most studied are fats and oils, including saturated fats and unsaturated fats. Fats and oils in the diet can promote the growth of cancer cells, and can also cause early mutation of normal cells, which can evolve into tumors. Both animal and vegetable fats should be reduced as much as possible. Excess fats, especially animal fats, can stimulate bile acid secretion in the small intestine. When the amount of bile acid in the intestine is too high, it can easily become carcinogenic and encourage the growth of cancer cells. Thus, high-fat diet is closely related to the occurrence of rectal cancer. 2, increase the intake of fiber in the diet: the main function of fiber in food is to normalize intestinal peristalsis, increase the volume of stool, and reduce the time of stool staying in the rectum. The fecal matter present in the colon makes bacteria active and may produce carcinogenic substances. When there is a lack of fiber in the diet, the feces in the colon becomes dry and hard, and this, combined with a sluggish passage and weakened abdominal wall muscles, makes the evacuation time longer, and if it takes too long, the chances of developing colon cancer are relatively higher. Many studies have confirmed that fiber in food can dilute potentially carcinogenic substances in fats and oils, and can also accelerate the rate at which carcinogens are excreted from the body through the digestive system.