Weight loss constipation need to understand the cause and then targeted treatment, may be related to excessive dieting, strenuous exercise, lack of water, according to the cause of the diet as well as exercise to do some adjustments, and scientific weight loss. 1. Excessive dieting: excessive dieting when choosing to lose weight, resulting in reduced intake of crude fiber content, affecting intestinal peristalsis can cause constipation. So in the weight loss need to increase the appropriate fiber content, but also need to supplement the vitamins that the body needs. 2. Strenuous exercise: repeated strenuous exercise will lead to a large amount of human blood flow to the muscle tissue, the digestive tract appeared hypoxia or ischemia symptoms, easy to cause constipation. It is recommended to adjust the way of exercise, try to choose to do aerobic exercise, such as practicing gymnastics, doing yoga and so on. 3. Lack of water: If the lack of water during weight loss leads to dry stools, it may affect normal defecation. It is recommended to drink plenty of water to ensure adequate hydration, which can increase the lubrication of stools. It is recommended to go to the hospital for examination before treatment, and analyze the cause through professional examination and then targeted treatment to avoid unauthorized use of medication.