Bowel cancer mainly refers to colorectal cancer including rectal cancer and colon cancer, which is one of the common malignant tumors. Bowel cancer is a disease of living habits also known as affluenza, which is obviously related to eating too fine, eating too greasy, too little dietary vitamins and low exercise, so what are the bad habits in life that can easily lead to the occurrence of bowel cancer? A. Eating too much meat and fish and too much calories With the country’s affluence and improvement of living standard, people’s diet is inclined to high protein, high fat and high calories, that is, three high diets. High-protein diets tend to cause an increase in the number of anaerobic bacteria in the intestine, and a large number of anaerobic bacteria can break down bile acids into unsaturated polycyclic hydrocarbons with carcinogenic effects. High protein food can also produce carcinogenic heterocyclic amines in the process of frying or baking, plus high protein food contains little fiber, which can easily cause constipation, and constipation causes fecal retention for too long, which makes carcinogenic substances gather and inevitably increase the risk of colorectal cancer. Most people believe that a high-fat diet can increase the biosynthesis of bile acids and promote their entry into the intestine, thus inhibiting the reabsorption of bile acids in the small intestine and increasing their concentration in the large intestine, and the high concentration of bile acids in the intestinal lumen has a pro-carcinogenic effect. ②DNA damage; ③directly interfering with DNA metabolism, increasing the admixture of building blocks and DNA synthesis outside the normal program; ④increasing ornithine decarboxylase activity of colonic mucosal cells; ⑤inhibiting the proliferation of lymphocytes in the lamina propria of intestinal mucosa and reducing immune function. The strongest association between meat intake and colorectal cancer, especially after unscientific (frying, deep-frying, smoking, grilling) preparation, is a definite risk factor for the development of colorectal cancer. The latest findings from the American Cancer Prevention Research Nutrition Group show that long-term high intake of red meat and cooked meat products increases the risk of colorectal cancer by 40%. Possible mechanisms for red meat to increase the risk of colorectal cancer include: ① the production of heterocyclic amino acids during the cooking of lean meat; ② the endogenous nitrite products in the intestinal lumen of the large intestine; ③ the role of iron in the oxidation. Second, less vegetables and fruits are eaten and dietary fiber intake is not enough Africans mainly eat foods containing more dietary fiber, such as corn and vegetables, and intestinal cancer is very rare, compared with Europe and the United States, where intestinal cancer is highly prevalent, dietary fiber intake is often insufficient. In recent years, the incidence of colorectal cancer in China has continued to rise, which is the reflection and result of the “westernization” of dietary structure. Dietary fiber refers to plant polysaccharides and lignin in plant foods that cannot be hydrolyzed by human digestive enzymes, and is rich in cereals, grains, fresh vegetables and fruits. Foods with dietary fiber have a protective effect on the intestinal tract and can reduce the incidence of colorectal cancer. This is because dietary fiber can increase the volume of stool, dilute carcinogens, shorten the passage time of stool in the intestine, and reduce the contact between colon mucosa and fecal carcinogens. Dietary fiber can also reduce the risk of colon cancer by promoting the secretion of mucin and strengthening the mucosal barrier, thus reducing the attack of toxic substances in the intestine on the intestinal epithelium. If people are too picky about food in daily life, eat too fine and rarely eat vegetables, it will cause dietary fiber deficiency. Long-term lack of dietary fiber will definitely increase the risk of colon cancer. Some people like to eat pickled foods, such as salted meat, ham, salted fish, pickled vegetables and kimchi. Unbeknownst to them, these pickled foods contain a large amount of nitrosamines, many of which are strong carcinogens and can induce malignant tumors in many tissues and organs in animal experiments. Colorectal cancer is no exception and can be caused by the effect of these nitrosamines carcinogenic substances, resulting in an increased incidence. In addition, due to the general destruction of vitamins in pickled foods, the frequent consumption of these foods is very likely to cause vitamin deficiency or deficiency. Studies have shown that vitamin A, vitamin B2, vitamin C and vitamin E are all related to reducing the relative risk of colorectal cancer, and deficiency can cause an increased risk of colorectal cancer. Therefore, people should eat less pickled foods, especially the middle-aged and elderly people should not eat such foods often to protect themselves and reduce the risk of cancer. With the improvement of people’s living standard and the popularization of home cars, going out in cars and operating computers and cell phones at work have become the norm. According to the latest sports medicine research, one-time medium to high-intensity exercise can enhance immunity. Lack of exercise can reduce the level and function of T cells, B cells, natural killer cells and interleukin-I in the mechanism, which is not conducive to killing cancer cells in the body. People with higher body mass index engage in less physical activity, which is not conducive to maintaining an internal environment (lower insulin, glucose and triglyceride levels) that is not conducive to the growth of cancer cells in the body. Studies have shown that the likelihood of colorectal cancer is significantly increased in static workers and those who lack exercise in general. The mechanism for this is, on the one hand, that regular exercise reduces random non-propulsive segmental movements of the intestine and increases effective bowel movements. On the other hand, it is because exercise promotes prostaglandin secretion, prostaglandin stimulates intestinal peristalsis, and the strengthening of intestinal peristalsis can shorten the passage time of intestinal stool and reduce the contact between intestinal mucosa and carcinogens in stool. Many people, especially young people, often live irregularly, stay up late, do not eat breakfast and do not have regular bowel movements. These habits can cause gastrointestinal dysfunction, especially many people are too busy to care about the toilet, and it is common to hold stool when traveling on holidays and inconvenient journeys. It is a bad habit to hold stool. If stool is not discharged in time, water will be repeatedly absorbed by the intestines, resulting in dry stool and constipation, which is also one of the causes of colon cancer.