1, eat less or do not eat pickles: pickles contain a large number of nitrites and secondary amines, in the stomach under the action of suitable acidity or bacteria, the synthesis of very strong carcinogenic nitrosamines. Advocate refrigerator refrigeration preservation. 2, do not eat or eat less smoked and fried food: smoked fish, bacon, fried, baked, burnt food and reused high-temperature cooking oil contain a large number of carcinogens such as 3-4 benzopyrene and cyclic aromatic hydrocarbons, should be consumed as little as possible. 3, do not eat moldy food: moldy food is often encountered in daily life, mold is caused by contaminated mold, some of which are strong carcinogens; certain foods produce a large amount of nitrite and secondary amines under the action of toxic fungi, which can cause cancer by synthesizing nitrosamines in the stomach after entering the organism. Smoking is related to gastric cancer. Smoke contains many carcinogenic or carcinogenic substances such as benzo(a)pyrene, polycyclic aromatic hydrocarbons and dibenzocarbazole, which is one of the causes of esophageal cancer and gastric cancer. Although alcohol itself is not a carcinogenic substance, strong alcohol can stimulate the gastric mucosa, damage the mucosal tissue and promote the absorption of carcinogenic substances, which is more harmful if drinking alcohol and smoking at the same time. Because alcohol can enhance the permeability of cell membranes, thus strengthening the absorption of carcinogenic substances in smoke. 5. To develop good eating habits: if the diet is not regular and quantitative, overeating, eating too fast and too hot, it is a damaging stimulus to the stomach, which has a certain relationship with the occurrence of stomach cancer. Meanwhile, high salt intake and good sulking during meals are also related to gastric cancer. 6.Eat more fresh vegetables and fruits: Eat more foods containing vitamin A, B and E and strengthen protein intake appropriately to protect gastric mucosa. 7.Protect the hygiene of edible water: Because contaminated water sources contain many kinds of cancer-causing metal ions, make sure to use regular tap water, and try to use well water in rural areas. 8.Actively treat precancerous lesions: atrophic gastritis is closely related to gastric cancer and is a precancerous lesion; gastric ulcer malignant gastric cancer accounts for 5-10%; gastric polyadenomatous polyp is more common than single polyp, and polyp diameter over 2cm shows a tendency of malignant transformation; pernicious anemia is also related to gastric cancer. 9.Keep your mood relaxed: bad psychological stimulation is a strong “cancer promoter”. Being too introverted, withdrawn, depressed, suspicious, silent, reticent, narrow-minded, etc. are typical “cancer personalities”.