You can massage your abdomen during weight loss, eat appropriate coarse fiber food, and use laxative medication if necessary. Many people will lose weight by dieting, this method of weight loss will have an impact on health, and some people will not have a bowel movement because of dieting and weight loss. In the absence of stool, you can properly massage the abdomen, abdominal massage should be clockwise, gentle, so as to promote the movement of the colon, after the movement of the colon, the contents of the intestines can be eliminated faster, so there is a role in improving the lack of stool. Weight loss during the diet can be appropriate to eat coarse fiber food, such as corn, oats, celery, leeks, etc. The coarse fiber in this type of food can absorb water, increase the volume of stool, promote intestinal peristalsis, and less calories, will not affect the weight loss effect. For people with constipation that lasts for a longer period of time can be treated with a catheterizing drug, common catheterizing drugs are lactulose, fruit guide tablets, hemp nut lozenges, aloe capsules, etc.