How to digest and absorb food

It takes four hours for food to be digested in the stomach. After that, the stomach transports food to the small intestine. After further decomposition and absorption, the components needed by the body are absorbed, and the unwanted components are sent to the large intestine. The middle is excreted through intestinal peristalsis. Everyone's physique is different, and the time of discharge is also different. It basically takes about 8 to 10 hour. Usually, eating more food fiber food is helpful for the body to excrete.

The digestion of food begins in the mouth, where food is mainly digested mechanically (food is ground). Because the food stays in the mouth for a short time, the digestion in the mouth is not significant.

After food enters the stomach from the esophagus, it is mechanically digested by the muscles of the stomach wall and chemically digested by the gastric juice. At this time, protein in food is preliminarily decomposed by pepsin in gastric juice (with the participation of gastric acid), and the contents in the stomach become gruel-like chyme, which is pushed to the duodenum several times through pylorus. After chyme enters duodenum from stomach, it begins to be digested in small intestine.

Small intestine is the main place for digestion and absorption. Food is chemically digested by pancreatic juice, bile and intestinal juice and mechanically digested by small intestine, and various nutrients are gradually decomposed into simple absorbable small molecules and absorbed in small intestine. Therefore, after food passes through the small intestine, the digestion process has been basically completed, leaving only indigestible food residues, which enter the large intestine from the small intestine.

The large intestine has no digestion, but only a certain absorption function.