The following are some of the cases of diarrhea: 1. Because the gelatin cake is rich in many nutrients and has a nourishing and greasy nature, after eating it, it will bring burden to the intestines and stomach, which will affect the digestive ability and lead to diarrhea. 2. There are problems with the materials and production methods, because the gelatin cake is mainly composed of collagen and other substances. 3, eat infected bacteria or expired gelatin cake, eat gelatin cake a large number of bacteria and viruses to stimulate the intestinal mucosa, intestinal peristalsis will be abnormal, diarrhea will occur. 4, allergic to gelatin cake, if allergic to gelatin cake, after eating the reaction may lead to increased permeability of the gastrointestinal mucosa, thus triggering diarrhea.