Not having a bowel movement after eating less is mainly caused by insufficient fecal volume, and may also be related to slow gastrointestinal peristalsis.
If the intake of food is small, not able to produce enough feces, when the volume of feces is insufficient, it may not defecate for a while, thus appearing constipation symptoms; and when the amount of food intake is reduced, it often also leads to the body’s metabolism slows down, intestinal peristalsis also slows down, and feces stays in the intestines for a longer period of time, which leads to the lack of defecation.
If the lack of bowel movement is caused by eating less, you should pay attention to adjusting your diet and increasing your food intake, not excessive dieting. Usually after increasing diet, the symptoms of not having bowel movements will be relieved. Also pay attention to the appropriate increase in water intake, drink more water. If you continue to have no bowel movement, it is recommended that you seek medical attention from a medical professional.