As you described, if you often stay up late, you may be a little thin, but this thinness still belongs to your body and has some influence. Constantly consuming the body's nutrition, including its own physical strength, is different from other weight loss situations. And there may be other discomfort in the body, such as frequent staying up late, stomachache, irregular diet and so on. But in general, people who often stay up late are still obese. Because you may eat some food or something when you stay up late. You are used to sleeping on the sofa or bed at night, and your body doesn't do any exercise. It is easy for the heat of food to be absorbed in the stomach. If it can't be digested, it will accumulate in your stomach, which will easily increase the pressure on your stomach. In addition, people who often stay up late are prone to dizziness and memory loss. Including some pain in my eyes and some discomfort in my heart. Your immunity will decline a little, and your skin will change a little. These are all caused by staying up late. Therefore, whether you are obese or thin after staying up late, you should pay attention to your physical condition. There may be some people who often stay up late because of work. But you must rest more and get more sleep during the day. Not staying up late is also the best way to avoid physical fatigue. Also add nutrition, try to learn to eat less and more meals at night, such as some greasy food and spicy food. Try to choose fruits and vegetables and eat more. Avoid affecting sleep. Or just affect digestion. Exercise more at ordinary times, especially in the morning and evening, so that you can recuperate your body. And try not to have some bad feelings about your own psychology. This is also the need to maintain a good and comfortable mentality. Usually, we should reduce the use of computers at night and so on. Still have to go to bed early and get up early.