Colorectal cancer is one of the most common cancers in the world, accounting for about 10% of the global cancer incidence rate. According to WHO, more than 608,000 people die from rectal cancer every year worldwide, and it is the second most common cancer in women and the third most common cancer in men. With the change of living habits and diet structure as well as the acceleration of population aging, colorectal cancer ranks third in the incidence of malignant tumors in China, and the incidence rate has been on the rise in recent years, which brings heavy economic burden to patients’ families and society. As a cancer of the digestive tract, many people consider that its development is closely related to diet, especially meat, and a news article in October 2015 quoted the Daily Mail as saying that the World Health Organization is expected to declare processed meat products such as ham and bacon as “carcinogens” on the 26th, i.e. The most carcinogenic substances, along with cigarettes and arsenic, are “in the company”.” Once again, meat has been pushed to the forefront of cancer-causing factors. According to the World Cancer Research Fund, there is credible evidence that consumption of processed meats is a cause of colorectal cancer. Processed meats are meats that have been salted, smoked or preserved with preservatives, including cured meats, hot dog sausages and other sausages. Data show that eating processed meat increases the risk of colorectal cancer, regardless of the amount of processed meat consumed. Therefore, the World Cancer Research Fund recommends that a person should not consume more than 500 grams of red meat (including beef, lamb and pork) per week, i.e., no more than 700 grams of raw meat. According to the latest news from the International Agency for Research on Cancer (IARC), which is responsible for the review of carcinogens under WHO, fresh red meat is classified as a Group 2A carcinogen for colorectal cancer, which is likely to cause colorectal cancer in humans; it is also found to be associated with pancreatic cancer and prostate cancer. Processed meat as a group 1 carcinogenic factor for colorectal cancer is identified as a causative factor for colorectal cancer. Processed meats such as ham and bacon, and even fresh red meat, which are everyday foods that cause cancer, do seem like “bad news” to the general public. But in fact, in the medical community this has long been an open secret, mainly because it can increase the risk of colorectal cancer. Meat, high-fat diet, smoking and alcohol abuse, and lack of exercise are considered to be the risk factors for cancer in the modern age. One study showed that drinking 45g of alcohol per day increased the risk of colorectal cancer to 1.41 times; smoking increased the risk of colorectal cancer by 1.2 times; and obese people were 1.45 times more likely to have colorectal cancer than normal weight people. Too much red meat in food, such as pork, beef, lamb, or too much processed meat, is also associated with colorectal cancer. Too little dietary fiber can also increase the chances of colorectal cancer. However, meat consumption is not harmless. First of all, red meat is an important source of essential iron, zinc, vitamin B12 and protein, which are in a sense essential for the human body. In practice, vegans are often prone to nutritional imbalances or deficiencies in certain nutrients. Therefore, in the face of essential nutrients, with a definite but low risk of increased risk, one should not be so concerned that one chokes on meat and gives it up completely. Therefore, it is recommended to limit red meats appropriately, to strictly limit the total intake of processed meats, and to avoid grilled and especially burnt meats as much as possible. Increase the intake of poultry, especially fish, as appropriate. The intake of meat should choose reasonable cooking methods, such as choosing pot stew, steaming or microwave heating, and avoiding high-temperature methods such as barbecue and frying. Therefore, a reasonable and moderate intake of meat does not affect health, do not over-amplify the disadvantages. A healthy lifestyle, a reasonable diet and a healthy mindset in life are still the only ways to prevent cancer. Repeated hemorrhoids that do not heal, unexplained anemia and weight loss; unexplained stomach distention and pain; persistent anal ulcers and persistent anal pain. If any of the above listed early symptoms of rectal cancer appear, you should go to hospital for examination as soon as possible.