In general, it is better for the body to defecate in the morning or within 2 hours after breakfast. Defecation, is a physiological phenomenon, when the feces filled with rectal stimulation of the intestinal wall receptors, sending impulses into the lumbosacral spinal cord within the low-level defecation center, and at the same time, uploaded to the cerebral cortex and produce the desire to defecate. If the environment permits, the cerebral cortex will send out impulses to increase the excitability of the defecation center and produce the defecation reflex, which will make the sigmoid colon and rectum contract and the anal sphincter diastole, thus promoting the discharge of feces. Within 2 hours after waking up in the morning or after breakfast, usually after a night of digestion, the food is digested and absorbed by the digestive tract, and has been sufficiently turned into food residue and stored in the form of feces in the sigmoid colon. In the morning after waking up with gastrointestinal peristalsis and increased intra-abdominal pressure after breakfast, feces or into the rectum, stimulate the intestinal wall to produce stool, this time defecation is better for the body. Develop a regular bowel habit, is conducive to the health of the body.