The phenomenon of constipation during the fat loss period may be caused by low food intake, food type and lack of exercise. 1. Low food intake: during the fat loss period, you will control your diet and eat less food, so that there will be less excreta in the intestines, and the small amount of food is difficult to form, and it can’t be stimulated better, so you won’t have the intention to poop, and after a long time, the feces will pile up in the intestinal tube, and the water will be over-absorbed, resulting in excessively dry stools, and constipation will occur. 2. food type: may be in the fat loss period, the intake of food containing less crude fiber, can not well promote intestinal peristalsis, time will lead to constipation. 3. Lack of exercise: some people in the fat loss period, just rely on diet control to achieve the purpose, while the amount of exercise is very little, so that the gastrointestinal peristalsis will become worse, so it will be easy to appear the symptoms of constipation. It is recommended to reasonably match the diet, appropriate increase some exercise, if the constipation is more serious, it is best to go to the hospital in time.