1.Eating less or no food rich in saturated fat and cholesterol, including: lard, butter, fatty meat, animal offal, fish roe, etc. are all contraindicated in the diet of colorectal cancer. 2. Limit vegetable oil to about 20-30 grams (about 2-3 tablespoons) per person per day. 3.No or less fried food is a dietary contraindication for colorectal cancer. 4.Eating foods containing unsaturated fatty acids in moderate amount, such as olive oil, tuna, etc. 5.Add more than 35 grams of dietary fiber daily. 6.Eat more foods rich in dietary fiber: konjac, soybean and its products, fresh vegetables and fruits, algae, etc. 7.Replace fine grains with some coarse grains. 8.Eat more fresh vegetables and fruits to supplement carotene and vitamin c. 9Eat walnuts, peanuts, dairy products, seafood, etc. in moderation to supplement vitamin e. 10.Pay attention to the intake of malt, fish, mushrooms and other foods rich in trace elements of selenium is the dietary contraindication of colon cancer.