If you don't eat when you stay up late, your body has been consuming energy, so your blood sugar consumption is almost the same in the morning. When exercising again, the body should use protein and fat for energy supply, which makes it easier to lose fat. However, staying up late can lead to endocrine disorders, and I don't believe you can go without eating all night. If you want to lose weight, you'd better go to bed early and get up early, and exercise for 20-30 minutes before eating in the morning, provided, of course, that your blood sugar is not too low. .