When to defecate after eating is related to the type of food, the amount of food eaten, gastrointestinal tract function, etc. It is not possible to say clearly when you can defecate. 1. Food type: If you eat hot pot, barbecue and other stimulating food, gastrointestinal tract peristalsis accelerated, may defecate time from the meal is relatively short. And if you have eaten dry food such as potpourri and potato chips, which are difficult to digest and easy to be constipated, the time of defecation may be longer from the meal. 2. Amount of food eaten: If you eat less and have less food residue after digestion, you will have a later bowel movement after meals. If you eat more and have more food residue, you can have a bowel movement sooner after eating. 3. Gastrointestinal function: the elderly gastrointestinal function decreases or gastrointestinal disease patients, intestinal peristalsis is slow, defecation after eating later. Young adults have better gastrointestinal function and have faster defecation after eating. Normal bowel movement is between 1 time in 2 to 3 days and 2 to 3 times in 1 day. There are many other factors that affect how long it takes to have a bowel movement after a meal, such as the amount of daily activity. When to defecate after eating varies from person to person, usually pay attention to a light diet, balanced nutrition, and develop good bowel habits. It is recommended that patients who have abnormal bowel movements should seek medical attention and follow the doctor’s instructions.