How to eat and nourish is always an important question for the family members of tumor patients, and it is also a question that I am often asked in the outpatient clinic. Different patients should adjust their diet according to their tumor type, stage, physical condition and season. The following are 15 international cancer prevention codes, which will have certain guidance for the diet of tumor patients and their family members: 1.Food is mainly plant food; 2.Maintain proper weight, avoid too light and too heavy; 3.Maintain proper weight, avoid too light and too heavy; 4.Frequent and proper exercise; 5.Eat more vegetables and fruits; 6.Eat more cereals, beans and root vegetables; 7.It is better not to drink alcohol or limit alcohol; 8.Limit meat; 9.Control animal food; 9.Control animal food. Meat; 9, control the intake of animal fat, appropriate intake of vegetable fat; 10, eat less salt, adults consume less than 6 grams of salt per day; 11, eat more fresh food, less canned food; 12, food to ensure fresh, food should be frozen, refrigerated preservation, food should not be hidden for a long time; 13, pay attention to food safety; 14, cooking methods to science, do not eat burnt food; 15, less nutritional supplements 15.Take less nutrients, supplements.