The causes of diarrhea once you eat are: 1, intestinal infection, such as eating food with viruses or bacteria and other microbial infections, accompanied by cold will be more serious. 2, liver disease, liver disease, liver detoxification capacity will be significantly reduced, intestinal function will be stimulated by harmful substances in the body, producing a large number of intestinal toxins, which in turn lead to mast cells proliferation, growth, release a large number of histamine after causing diarrhea. 3, individual differences, weak constitution, low immunity of the population once accidentally eat a variety of normal food, can also cause diarrhea. If diarrhea occurs, it is first recommended to drink salt water, which also has an anti-inflammatory and disinfecting effect on the stomach and intestines. Usually, you should eat a light diet and not eat spicy, fatty and overly sugary foods. Once frequent diarrhea occurs, you can first take Zhengqi water and Gastroenterology granules for treatment, and if necessary, go to the gastroenterology department of the hospital for examination and treatment in time.