The main reason for patients with pancreatitis to fast is to allow the pancreas to rest so that the inflammation of the pancreas can be relieved or recovered. When inflammation of the pancreas occurs, it can mainly be caused by the pancreatic self-digestion, which is the activation of pancreatic enzyme secretion inside the pancreas. During the treatment of pancreatic inflammation, the pancreas needs to rest as much as possible, so it is necessary to reduce the stimulation of some digestive juices to the pancreas, such as reducing the stimulation of gastric juice, duodenal juice and bile to the pancreas, so the patient is not able to eat and needs to fast, and even some patients need to place a gastric tube to further drain the fluid inside the stomach to the outside of the body through the gastric tube, which can also contribute to the inflammation of the pancreas. The actual pancreatic inflammation can also be promoted.