The audio-visual products and series of books of "Nutrition and Dietary Guidance for Chronic Diseases in China" were compiled by the Nutrition and Metabolism Management Branch of the China Association for the Promotion of International Health Care and Nutrition and nine major hospitals. This book describes the relationship between various foods and tumors, and how to eat for tumor patients. Recent studies have proved that environmental factors may be an important factor in the incidence of tumors. Among them, eating habits, insufficient nutrient intake, excessive intake or imbalance between nutrients are all important aspects. The tumors affected by the above factors mainly include esophageal cancer, stomach cancer, liver cancer, colorectal cancer, breast cancer, bladder cancer and lung cancer. The pollutants in the diet, such as aflatoxin, aggravate the lack and imbalance of certain nutrients, thereby enhancing the carcinogenic effect. Nutrient intake is directly related to tumor occurrence, development, treatment effect, quality of life and survival period.