Food is digested and absorbed through the mouth, esophagus, stomach, small intestine, large intestine, liver, pancreas, and then the food residue is excreted from the body by the anus. But the whole process also requires the coordinated cooperation of several organs. Food needs to be chewed and mixed through the mouth first, with the salivary glands helping to digest and break down starchy foods. Transported through the esophagus to the stomach, preliminary dissolution under the action of gastric acid and gastrointestinal peristalsis can turn large particles into some small particles. At this time, bile, amylase and other substances secreted by the liver and pancreas can also promote the digestion and absorption of food. The food is then excreted into the duodenum, into the small intestine, then into the large intestine, and finally out of the body through the anus. If symptoms such as constipation or diarrhea occur during the process of digestion and expulsion of food, it is recommended to consult a doctor promptly.