With the gradual popularization of cancer screening, more and more patients with early-stage tumors have been completely cured through surgery or other minimally invasive treatments. However, patients are still concerned about how to eat and drink to better maintain their health level and reduce the risk of recurrence and cancer. For this group of patients it is recommended to follow normal cancer prevention diet and exercise guidelines. Diet follows the principle of rational diet. A reasonable diet is a diet that meets reasonable nutritional requirements, promotes human health and prevents diseases, and is also called a balanced diet. Reasonable nutrition not only requires the provision of energy and various nutrients to meet the physiological needs of the human body through dietary combinations, but also takes into account a reasonable dietary system and cooking methods to facilitate the digestion, absorption and utilization of various nutrients, and at the same time, should also avoid imbalance in the proportion of dietary composition, as well as the loss of nutrients or the formation of hazardous substances in the process of cooking. Reasonable diet can make food and body needs to achieve a balance, which is not only manifested in the energy and each nutrient must meet the physiological needs of the body, but also manifested in the energy and nutrients and nutrients between the proportion of appropriate. A reasonable dietary structure not only meets the body’s physiological needs for reasonable nutrients, but is also an important indicator of quality of life. The World Cancer Research Organization/American Association for Cancer Research book Diet, Nutrition, and Cancer Prevention is exemplary in its food-based dietary guidelines. The group of experts put forward 14 dietary recommendations for cancer prevention: 1. Diversify food, choose plant-based diets rich in various vegetables and fruits, legumes, and use coarse grains. 2.Maintain normal body weight, avoid underweight or overweight, and limit weight gain to less than 5 kilograms throughout adulthood. 3, adhere to appropriate physical activity, if the lack of physical activity at work, should adhere to the daily 1 hour brisk walking or choose similar activities. 4.Eat more vegetables and fruits every day, the daily target amount is 400～800g. pay special attention to the intake of vitamin A and vitamin C should be sufficient. 5, daily intake of a variety of cereals, beans, roots and tubers, the daily target amount of 600 ~ 800g, and try to eat more roughly processed cereals. 6. It is recommended not to drink alcohol. If alcohol is consumed, it should be limited to less than 2 cups per day for men and less than 1 cup per day for women (1 cup is equivalent to 250ml of beer or 100ml of wine or 25ml of liquor). 7. Control the intake of meat, especially red meat, which should be limited to less than 80g per day. It is best to choose fish and poultry instead of red meat (beef, lamb, pork). 8. Limit foods with high fat content, especially animal fat. Choose vegetable oils, especially those with high monounsaturated fatty acid content and low hydrogenation. 9. Limit the intake of preserved foods and salt. 10. Avoid food contaminated with mycotoxins and stored at room temperature for a long time. 11. Pay attention to the refrigeration of perishable foods. 12. Pay attention to the processing methods of food. Do not eat burnt food and eat less fish or meat grilled directly over the fire. 13. Limit the use of food additives. Food additives, food pollutants and harmful residues should be standardized and tested. 14. Selection of nutritional supplements. Nutritional supplements are not necessary for people who follow this recommendation. In particular, although smoking is not part of the diet, any cancer prevention diet emphasizes “no smoking”.