Look at you. If you are not very fat, you may not lose weight. If you are fat, you will lose weight quickly, but remember that the rebound will be faster than when you are thin. Unless you only eat one meal in your life, I once lost more than 20 kilograms after dieting for 40 days, and then gained weight in less than a month, so dieting alone is not enough. I am a boy, and I have to exercise and eat to keep it up to now.