Poor gastrointestinal more will be due to affect the gastrointestinal tract digestion and absorption and thus cause wasting, if obesity, may be due to poor living habits, intestinal flora dysbiosis or the role of drugs. 1, poor living habits: if daily life is not often exercise, while long-term large intake of high-sugar, high-fat food, or long-term overeating, drinking, etc., coupled with their own fat metabolism ability is poor, not easy to consume, resulting in fat accumulation in the body, thus causing obesity; 2, intestinal flora dysbiosis: gastrointestinal diseases caused by intestinal flora dysbiosis, so that the flora will not be easily digested and absorbed sugar into fatty acids, so that people are more likely to be fat; 3, the role of drugs: some gastrointestinal diseases, such as Crohn’s disease, in the treatment of glucocorticoids may be applied, hormonal drugs in the long-term use will cause full moon face, buffalo back and other side effects and thus cause the performance of obesity; 4, disease factors: such as duodenal ulcer patients, hunger-induced pain can generally be gradually relieved after eating, therefore, to relieve pain uninterrupted eating, will make a lot of nutrients are absorbed, thus causing obesity. Therefore, people with poor gastrointestinal tract should pay attention to avoid excessive intake of indigestible and high-fat food in daily life, while eating less and more meals to reduce the burden on the gastrointestinal tract. In addition, you can increase exercise in daily life to enhance physical fitness and avoid gaining weight.