Stomach cancer is one of the most common malignant tumors in China, and once it occurs, the disease is very harmful, so we must take active measures to prevent it. The key to prevent stomach cancer is to develop good and healthy habits in life, such as the following nine habits can prevent stomach cancer well. Habit 1: 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 gastric cancer. Meanwhile, high salt intake and good sulking during meals are also related to gastric cancer. Habit 2: Pickles should be eaten less or not: Pickles contain a large amount of nitrite and secondary amines, which can synthesize nitrosamines under the action of suitable acidity or bacteria in the stomach, and these compounds are strong carcinogens. So the food should be fresh and try to eat it all at once. Habit three: overnight food cannot be eaten: when overnight food is left for a long time, the chlorophyll in it will undergo a chemical party reaction and carcinogenic substances will appear. Habit 4: moldy food can not be eaten: in daily life, we often encounter moldy food, mold is caused by contaminated mold, some of the mold is a toxic fungus, is a very strong carcinogenic substances, while some food in the role of toxic fungi produce a large number of nitrite and secondary amines, into the body under certain conditions, the stomach can synthesize nitrosamines and carcinogenic compounds. Habit 5: Smoked and fried food not to eat or eat less: smoked fish and bacon contain a large number of carcinogenic substances, such as 3-4 benzo(a)pyrene and cyclic aromatic hydrocarbons. Fried, baked, burnt food and reused high temperature cooking oil also contain such carcinogenic substances and should be consumed sparingly. Habit 6: Eat a diversified diet without partiality and pay attention to the reasonable combination of nutrients: eat more vitamin C-rich foods, such as fresh vegetables and fruits; eat more garlic, and raw garlic is better. Eat more vitamin A-rich foods, such as animal liver, carrot and egg yolk. Drink 2 cups of milk daily. Habit seven: protect the hygiene of the water for consumption: because contaminated water sources contain a variety of carcinogenic metal ions, so be sure to use regular tap water, and try to use well water in rural areas. Habit 8: Do not smoke and drink less alcohol: Smoking is also related to stomach 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 stomach cancer. Habit 9: Regular physical examination: the purpose is early detection, early diagnosis and early treatment.