First of all, if you want to lose weight healthily, I suggest you don't go to bed after 23 o'clock. In fact, sleeping can also lose weight and become beautiful. Then, if a boy is 20 years old and still growing taller, don't do gravity exercises, such as dumbbells and other fitness equipment. This will inhibit him from growing taller and losing 5 pounds. This is not difficult. He didn't have enough to eat at every meal, so he went out for a walk at night, and naturally he lost weight. Don't eat snacks, including biscuits and bread. You can eat rice, but eat less fried food.