It is said that our ancient people practiced meal sharing before the Qin and Han dynasties, and it was only later under the influence of the Hu people that the meal sharing system evolved into what it is today. There is a long-standing debate about meal sharing and meal combining, so here we will only talk about the benefits of meal sharing from the perspective of disease transmission, especially H. pylori infection. It is well known that many infectious diseases are transmitted through diet and water, such as hepatitis A/ E, cholera, dysentery, typhoid, etc. However, H. pylori infection, which is also transmitted orally but is not an infectious disease, has not received the attention it deserves. The discovery of H. pylori, abbreviated as HP, a spiral rod-shaped bacterium, was only unveiled in the 1980s, and the discovery of HP was such a milestone that two scientists, Barry J. Marshall and J. Robin Warren, were even awarded the Nobel Prize in 2005 for their outstanding research. In recent years, the understanding of HP has become more and more advanced, and it has become clear that HP plays a key role in the pathogenesis of many diseases. Chronic gastritis: HP infection can be detected in about 80% of patients with chronic gastritis; HP settles on the surface of gastric epithelial cells, disrupting the protective mechanisms of the gastric mucosa and causing gastritis. Gastric and duodenal ulcers: Because HP destroys the mucosal barrier of the stomach and duodenum, gastric and duodenal ulcers can develop when gastric acid and other factors act. Some patients may show symptoms such as bleeding, peptic perforation and pyloric obstruction. Gastric cancer: The metabolites of HP and other pathogenic factors lead to long-term inflammation and destruction of gastric mucosa, and a few patients may develop gastric mucosal transformation and then gastric cancer. Therefore, for postoperative patients with gastric cancer, if HP infection exists in the residual stomach, postoperative HP killing therapy is recommended. Gastric mucosal tissue-associated lymphoid lymphoma (MALT): The correlation between MALT and HP infection has been confirmed, and it is believed that MALT is a malignant tumor caused by abnormal proliferation of lymphocytes under the stimulation of antigens produced by HP infection, which can be divided into two types: low-grade malignant and highly malignant. Some low-grade malignant MALT can be cured by oral antibiotics to kill HP, and some cases can be cured by radiotherapy. Other diseases outside the stomach: Recent studies have found that HP infection can lead to a series of other diseases outside the stomach, such as 1) coronary heart disease: HP infection can interfere with fat metabolism and cause an increase in fibrinogen and C-reactive protein in the blood, leading to coronary heart disease; 2) iron deficiency anemia: HP infection leads to gastric mucosal atrophy and ulcers, causing gastrointestinal bleeding or affecting the absorption of iron, leading to anemia; 3) idiopathic platelet Decreased purpura (ITP): ITP is a thrombocytopenic disease of unknown cause, which can present with generalized petechiae, purpura, and even internal bleeding. In recent years, it has been found that some ITP and HP infection are very closely related, and a study in 2015 found that antigens produced by HP infection can enter the blood circulation and lead to ITP. In addition, HP infection has been associated with functional dyspepsia and atherosclerosis, among other diseases. Although not all HP infections lead to serious consequences and not all HP infections require sterilization treatment, reducing the spread of HP is certainly positive from a public health perspective. Therefore, regardless of infectious diseases, meal sharing is also worth advocating just from the viewpoint of the harmful effects of HP infection.