After food enters the stomach, the digestive system absorbs the nutrients from the food and the remaining residue is transformed into feces and stored in the sigmoid colon and rectum. When the stool stored in the sigmoid colon and rectum reaches a certain amount, it will stimulate the defecation system and form a defecation response. Some people have a high intake of food, especially foods rich in dietary fiber, which will not only stimulate intestinal peristalsis, but also increase the volume of feces, so the number of feces will increase accordingly. The number of bowel movements is also directly related to the peristaltic function of the gastrointestinal system. When the peristaltic function of the gastrointestinal system is strong, the time spent in the intestine for food residues is relatively short, so the number of bowel movements will also increase, while people with relatively slow peristaltic movement of the gastrointestinal system will have a relatively low number of bowel movements.