Young people should pay attention to the following aspects of lifestyle and dietary habits: 1. Develop good living and eating habits, eat less or do not eat pickled, fried, smoked and baked moldy food containing carcinogenic substances such as nitrosamines, to protect the gastric mucosa, diet should be regular and quantitative, do not overeat, avoid irritating food to the stomach caused by damaging stimuli, reduce the chance of gastritis and gastric ulcers. 2. Quit smoking and alcohol. Scientific research shows that smoking has a certain relationship with the occurrence of gastric cancer, and smoke contains many carcinogenic or carcinogenic substances, which is one of the main causes of gastric cancer; although alcohol itself is not a carcinogenic substance, but strong wine will stimulate the gastric mucosa, damage the mucosal tissue and promote the absorption of carcinogenic substances. This is because alcohol can enhance the permeability of cell membranes and thus strengthen the absorption of carcinogenic substances in smoke. 3.Supplement nutrition. Eating more fresh vegetables, fruits and milk can effectively prevent the occurrence of gastric cancer. Because fresh vegetables, fruits and milk are rich in vitamins, they can participate in repairing the natural barrier of the body and prevent chemical carcinogens from entering the body. The prevention of stomach cancer should start from the daily life in terms of lifestyle and dietary habits. Once early warning signs of gastric cancer are detected, one should actively check and have regular physical examination or cancer prevention screening.