Sun Simiao, a famous doctor in the Tang Dynasty, said in his Thousand Gold Formula, “Where you want to treat, first with food therapy, food therapy does not heal, and then the use of drugs.” In cancer etiology research, some people estimate that diet accounts for about 35% and smoking accounts for 30%. If the diet arrangement is reasonable, cancer risk can be reduced by 55%. 50 years ago, the United States stomach cancer mortality rate is very high, Japan is the world’s highest incidence of gastric cancer in the country, and now are significantly reduced, dietary control is one of the important factors. Shanghai in the past 30 years, meat and egg intake rose significantly, fat accounted for the proportion of total calories from 20.1% to 28%, the cause of death of tumors from the seventh to the first. Therefore, to prevent cancer, follow 3 principles in diet. First, don’t be too salty If you reduce salt, salt pickles and eat more fresh vegetables and fruits, then the incidence of stomach cancer will decrease. Nitrite is the first killer that causes tumors. Not fresh vegetables, cured ham, pickles contain this carcinogen. Normally conditions dietary nitrite will not cause harm to human health, only excessive intake of nitrite and lack of vitamin C in the body will cause harm to the human body. If you eat too salty, will destroy the gastric mucosa, prompting nitrate reduction into nitrite. Second, do not be too fine Modern people eat too fine food, making the intake of fiber greatly reduced. Fiber can adsorb a lot of water, promote intestinal peristalsis, accelerate the excretion of feces, so that carcinogens in the intestinal tract to shorten the residence time, the intestinal tract of the adverse stimulus is reduced, which can prevent intestinal cancer. Roughage, cereal, celery, fungus, etc. are all rich in fiber foods. But excessive intake of fiber will affect the absorption of many nutrients, so that the physical decline, so 10-30 grams per day is appropriate. Third, do not over-oil Surveys show that if the intake of oil, animal protein increases, the incidence of colorectal cancer, breast cancer, prostate cancer, pancreatic cancer will rise. High-temperature frying food will produce benzo(a)pyrene, heterocyclic amine compounds and acrylamide, and women’s lung adenocarcinoma may be related to the boiled and microwave steaming does not occur.