It can be said that most people are afraid of talking about cancer and stay away from cancer patients. In fact, more than 90% of cancers are caused by external environment. Epidemiological studies have found that about 40% of cancer patients are related to factors such as dietary habits, food processing and cooking methods, and 30% of cancers are related to lifestyle habits, especially to smoking and drinking. Many cancers can be prevented as long as we eat wisely and maintain a good lifestyle. Here are 10 dietary rules for cancer prevention. 1.Diversify food Pay attention to diversify food, mainly plant-based food, which should account for more than 2/3 of each meal, and plant-based diet should contain fresh vegetables, fruits, legumes and coarse grains, etc. 2.Control weight Avoid overweight or underweight, and limit the weight increase to no more than 5kg in adulthood. Overweight or excessive obesity can easily lead to the increased risk of endometrial cancer, kidney cancer and intestinal cancer. 3, do not eat burnt food Grilled fish, grilled meat should be avoided when the gravy is burnt. Fish, meat and bacon grilled directly on the fire can only be eaten occasionally. It is best to boil, steam and fry food. 4, eat more starchy food Eat 600-800g of various cereals, legumes, plant-based roots every day, the less processed the better. To limit the intake of refined sugar. Starch in food has a role in preventing colon and rectal cancer, and a high fiber diet has the potential to prevent colon, rectal, breast and pancreatic cancer. 5.Eat more vegetables and fruits Insist on eating 400-800g of various vegetables and fruits every day, which can reduce the risk of cancer by 20%, and eat 5 or more kinds of vegetables and fruits every day. 6.Do not advocate drinking alcohol such as drinking no more than one glass of alcohol per day (equivalent to 250ml of beer, 100ml of red wine or 25ml of white wine), regular drinking can increase the risk of oral cancer, throat cancer and esophageal cancer. 7. Reduce the intake of red meat Less than 90g per day, it is better to use fish and poultry instead of red meat. Red meat can increase the risk of colon and rectal cancer. At the same time, we should limit the intake of high-fat diet, especially animal fat, and should choose proper vegetable oil (such as olive oil, etc.). 8.Limit salt and seasoning Limit the intake of pickled food and control the use of salt and seasoning, high salt diet will increase the prevalence of stomach cancer. The World Health Organization recommends that salt intake should be less than 6g per person per day. 9. Don’t eat food that has been preserved for too long Don’t eat food that has been preserved for too long at room temperature and may be contaminated by fungal toxins. 10.Adhere to proper exercise 40-60 minutes of brisk walking or similar intensity exercise every day.