Staying up late may make you fat, first of all, staying up late can easily affect the human endocrine system, endocrine system abnormalities can easily lead to abnormalities in human endocrine hormones, which may cause excessive secretion of certain hormones leading to the phenomenon of human fatness. Secondly, staying up late will affect the human intestinal tract function, so that the human body gastric acid secretion gastric juice, thus causing the human appetite, resulting in excessive intake of food from the outside world, causing the human body to increase calories, the increase in human calories will cause the human body to gain weight. In addition, often stay up late will also cause abnormalities in human basal metabolism, abnormalities in human basal metabolism can easily lead to part of the toxins in the body, can not be excreted through the normal metabolism of the human body, long-term will cause the human body due to the accumulation of toxins, resulting in bloated, obese symptoms. It can be seen that staying up late may be fat.