Weight loss constipation may be caused by improper diet, insufficient water intake, mental factors, drug factors and other reasons. 1. Improper diet: eating less during weight loss, there is no food residue to stimulate the intestinal tract, resulting in slow intestinal peristalsis, the accumulation of feces for a long time not discharged, resulting in constipation; or eat less crude fiber food, can also lead to intestinal peristalsis slowed down and triggered by constipation. 2. Insufficient drinking water: During the weight loss period, a large number of strenuous exercise, sweating more caused by excessive loss of body fluids, insufficient drinking water caused by dry stools and induced constipation. 3. Mental factors: weight loss during the change of habits, mental tension, anxiety can lead to gastrointestinal peristalsis slow, induced constipation. 4. Drug factors: most diet pills contain laxatives, after taking dependence, after stopping the drug can lead to constipation. Weight loss constipation is recommended to adjust the diet and lifestyle habits in a timely manner, if the symptoms continue to be unrelieved, under the guidance of a physician to clarify the specific causes of the disease, to give targeted treatment.