Wanting to have a bowel movement right after eating may be caused by physiological reasons, such as eating too many vegetables, or it may be caused by pathologic reasons, such as acute enteritis, irritable bowel syndrome, and so on. 1. Physiological reasons: eating too much groundnut, cauliflower, oatmeal and other vitamin-rich foods can promote gastrointestinal peristalsis, resulting in the symptom of wanting to have a bowel movement after eating. 2. Pathological reasons: in acute enteritis, due to the infiltration of inflammatory substances, when the food passes through the gastrointestinal tract, it will stimulate the intestinal mucosa, and intestinal peristalsis will increase, so that the symptom of wanting to defecate after eating occurs. In patients with irritable bowel syndrome, gastrointestinal peristalsis is enhanced, and loose stools after meals may also occur. If the above symptoms persist, it is recommended to go to the hospital in a timely manner to clarify the cause of the disease under the guidance of a medical professional.