Colorectal cancer is one of the three most common cancers, and its mortality rate ranks second among the causes of death of malignant tumors. With the development of economy and change of lifestyle, the incidence rate of colorectal cancer is increasing at an average annual rate of 3% to 4%. So how can we prevent the occurrence of colorectal cancer? 1. Change dietary habits. Eat less food with high fat content. High-fat food is mainly beef, lamb and pork, usually called red meat, of which beef content is slightly lower; poultry and fish have a little lower fat content, but some sea fish are not low in fat. Therefore, the World Cancer Fund suggests that the daily intake of red meat should be kept below 80 grams, accounting for about 10% of the total calories. Eat more dietary fiber foods. Higher intake of dietary fiber is beneficial to the prevention of colorectal cancer. The cancer prevention function of dietary cellulose lies in: making fecal expansion, stimulating colon peristalsis, which is conducive to the discharge of harmful carcinogens in the intestinal tract; the product of the decomposition of certain cellulose is the nutrient material for intestinal mucosa and probiotics in the intestinal tract; a healthy intestinal environment, including regular defecation, is an important condition for preventing the occurrence of colorectal cancer. Foods containing more fiber are oatmeal, bran, soybeans, corn, vegetables in the garlic cloves, leeks, fungi and algae in the fungus, kelp, nori is a good product, grapes, strawberries, pears, persimmons fiber content is also high. Supplemental fiber in the food topped the list is sweet potato. 2, develop good living habits Strengthen physical exercise, quit smoking and limit alcohol. Polyps are one of the important causes of intestinal cancer, and obese people, especially those with abdominal obesity, the number of polyps as well as the probability of lesions are greater than ordinary people. Research has found that thirty minutes of moderate-intensity exercise a day can effectively reduce the number of polyps in the bowel that are susceptible to cancer. If people can spend thirty minutes or even longer on appropriate sports in their spare time, such as running, playing ball games, etc., they can unconsciously promote their intestinal peristalsis, so that feces containing toxic substances in the intestines can be excreted as soon as possible, and people can effectively prevent the occurrence of intestinal cancer. Early screening It is clear that at least 80% to 95% of colorectal cancers are evolved from polyps, and the process of small polyps → large polyps → high-level intraepithelial neoplasia → polyp cancer generally takes 5 to 15 years, so as long as the lesions are found in the process, and timely resection can eliminate the consequences of the colorectal cancer can be killed in the cradle in a timely manner. If you have never had precancerous colon polyps (adenomas), have no immediate family members who have had colorectal cancer or precancerous polyps (adenomas), have no history of various familial hereditary colorectal cancers, and have not had inflammatory bowel disease (chronic ulcerative colitis or Crohn’s disease), then you can start to consider screening at the age of 50, such as colonoscopy, and then retest in 10 years if there are no abnormalities. People with pre-existing polyps, such as polyps that are less than 1 centimeter, number less than 2, and are more low-grade polyps such as tubular adenomas, can be reviewed 5 to 10 years after endoscopic removal of the polyp. If the number of polyps is more than 3 or if there are high-risk polyps, repeat colonoscopy is recommended every 3 years. People with preexisting inflammatory bowel disease need to begin screening colonoscopy 8 to 10 years after the onset of symptoms. If one immediate family member has bowel cancer detected before the age of 60 years or 2 immediate family members have bowel cancer, screening colonoscopy should be started at age 40 years or at the age of their immediate family member minus 10 years when bowel cancer is detected.