Retrograde dissemination of cancer cells is one of the main symptoms of tumor infiltration and metastasis in colorectal cancer, which is a general term for colon cancer and rectal cancer. Colorectal cancer refers to malignant lesions occurring in mucosal epithelium of the large intestine under the action of various oncogenic factors, such as the environment or heredity, and has a poor prognosis and high mortality rate. Colorectal cancer is a malignant tumor of colorectal mucosal epithelial origin. It is one of the most common malignant tumors of the digestive tract. Reasonable diet for retrograde dissemination of cancer cells: 1. Increase the intake of fiber in diet: The main function of fiber in food is to make peristalsis of intestines normal, increase the volume of feces, and reduce the time that feces stays in the rectum. The feces present in the colon keeps bacteria active and may produce carcinogens. When there is a lack of fiber in the diet, the feces in the colon becomes dry and hard, which, combined with sluggish passage and weakening of the abdominal wall muscles, allows for prolonged emptying time, and, if it takes too long, the chances of developing colon cancer are relatively high. Many studies have confirmed that the fiber in food can dilute the possible carcinogenic substances in fats and oils, and can also accelerate the speed of carcinogenic substances through the digestive system out of the body. Reduce the intake of fats and oils in the diet: The relationship between diet and cancer has been studied the most in terms of fats and oils, including saturated fats and unsaturated fats and oils. Dietary fats and oils can promote the growth of cancer cells, and can also cause normal cells to mutate early and evolve into tumors. Both animal fats and vegetable fats should be minimized as much as possible. Excess fats, especially animal fats, can stimulate bile acid secretion in the small intestine. When the amount of bile acids in the intestines is too high, they can easily become carcinogens and promote the growth of cancer cells. Thus, it can be seen that high-fat diet has a very close relationship with the occurrence of colorectal cancer. 3. Take light diet: Taking light diet is something that patients with colorectal cancer need to pay attention to. Moreover, patients with this disease mostly have symptoms such as loss of appetite, nausea and even vomiting, therefore, it is advisable to take light diet and avoid oily and greasy food. Avoid eating chili, chili is very stimulating to the intestinal tract and anal area, and it has great stimulating effect on the cancer. Some people who like spicy food, even if they can not give up the spicy diet immediately, they should slowly reduce the spicy taste in their diet, and eventually avoid using chili.