Rectal cancer is a disease with high incidence nowadays, and such malignant tumors need to be treated actively, besides cooperating with doctors to do a good job in treatment, patients also need to do a good job in daily life to take care of the measures, so what can be eaten in the diet of rectal cancer, for this problem, let’s learn more about it. One should reduce the intake of fats in the diet: excessive 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. Second, to 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 speed of carcinogenic substances being expelled from the body through the digestive system. The above is what patients with rectal cancer should pay attention to in their daily diet. Besides taking good care of their diet, they also need to pay attention to other aspects, and hope that rectal cancer patients can face the disease with a positive attitude after discovery.