First of all, why sleep can help you lose weight, because one of the main reasons for getting fat is the lack of growth hormone secretion in the human body. Growth hormone is a natural hormone secreted by human body. Its main function is to promote the growth of bones and muscles, and at the same time accelerate the burning of body fat. The secretion of HGH is the most vigorous at night (midnight 1 1 to 2 am). After the human body goes to sleep, its function tends to be slow, but its metabolic function will continue, and the energy (heat) accumulated in the body will continue to burn, thus losing weight.

Poor sleep is the main factor leading to weight gain and obesity, especially it will increase abdominal fat. Poor sleep will increase appetite. Because when you don't get enough sleep, your body will release more gastrin and less leptin, making you feel hungry and prone to overeating. Moreover, lack of sleep will produce too much cortisol, which is also a stress hormone and will increase appetite. Lack of sleep will change the way your brain works, making it more difficult for you to make healthy choices and resist food. People with poor sleep tend to consume more calories, reduce your resting metabolic rate, lead to muscle loss (muscles burn more calories than fat at rest), increase the bad habit of eating supper, lead to less activities during the day, lead to insulin resistance, and begin to accumulate fat around the abdomen.

One: the relationship between sleep and weight loss. In fact, the main reason why sleep is as good as weight loss is the secretion of hormones. Sleep time will affect the levels of two important appetite hormones, namely leptin and gastrin. Leptin is a hormone that reduces appetite, so high levels can increase satiety. On the other hand, gastrin is a hormone that stimulates appetite and will enhance hunger. Lack of sleep can increase gastrin level and decrease leptin level. Therefore, there will be a great increase in appetite, which will bring overeating and a physical environment where calories are difficult to burn, which is not conducive to weight loss. In addition, when you stay up late, it will increase the secretion of cortisol, make your body synthesize fat faster and reduce your weight loss.

Two: Sleep only plays an auxiliary role, so some people who lose weight will think that since sleep can promote fat burning, will I get thinner and thinner if I sleep for more than ten hours every day? But in fact, sleep only affects your weight loss efficiency, not the decisive factor. You still need enough exercise and a healthy diet to lose weight better. But if you just want to lose weight by sleeping, it is absolutely impossible.