Currently, there are 934,000 new cases of gastric cancer worldwide every year, among which nearly 400,000 are in mainland China; the disease and mortality rate are more than twice the world average, and on average, one Chinese person dies of gastric cancer every three minutes. The main early symptoms of gastric cancer include the following: 1.More than 80% of patients will experience pain in the upper abdomen. 2.About 1/3 of the patients will have stuffy stomach, epigastric discomfort, loss of appetite, indigestion, accompanied by acidity. 3.1/3 of patients may have unexplained weight loss, emaciation and fatigue, although there are no obvious digestive system symptoms. 4.Some patients show symptoms such as panacidity, heartburn, nausea, vomiting, belching or black stool. In the middle and late stages of gastric cancer, there are more symptoms such as upper abdominal pain, gastrointestinal bleeding, perforation, pyloric obstruction, emaciation, weakness, metabolic disorders and corresponding symptoms caused by cancer spreading and metastasis. The main factors of gastric cancer in young people Serious lack of sleep, irregular diet, high work and psychological pressure, as well as discomfort in the stomach or infection of Helicobacter pylori are the “main factors of gastric cancer in young people”. Therefore, it needs extra attention. Prevention of gastric cancer starts from dietary habits 1. Good dietary habits Bad dietary habits such as irregular diet, overeating, eating too fast and too hot, and preferring too hard food can cause damaging stimulation to stomach and lay the hidden danger for the occurrence of gastric cancer. Therefore, forming good eating habits is the foundation of preventing stomach cancer. 2.Eat more fresh vegetables and fruits Eat more fresh vegetables and fruits rich in vitamin A, vitamin B and vitamin E. Properly strengthen the protein intake, which will play a protective role for gastric mucosa. Smoking and drinking are the most common factors that increase the risk of cancer. Smoking and drinking can greatly increase the risk of stomach cancer, and benzo(a)pyrene, polycyclic aromatic hydrocarbons, dibenzo and other carcinogenic or carcinogenic substances in smoke are one of the diets that induce stomach cancer; and alcohol can stimulate the gastric mucosa, damage the mucosal tissue and promote the absorption of carcinogenic substances. Therefore, if you want to prevent stomach cancer, you must quit smoking and alcohol. Pickles contain a large amount of nitrite and secondary amines, which can synthesize strong carcinogenic nitrite compounds in the stomach. Therefore, to prevent the occurrence of stomach cancer, we should eat more fresh food and eat less or no pickles. 5.Do not eat smoked or fried food. Smoked or fried food can also produce a lot of carcinogenic substances, and reused high temperature cooking oil can also contain such carcinogenic substances, so it should be used as little as possible.