16- 17 years old, height 177, weight 100 kg, a little embarrassed, but normal. There is a boy in my neighbor's house. When he was 18 years old, he was 180, only 100 kg. But everything is normal except being thin and coughing in winter. I went to college and now I have gained a lot of weight. Boast that you have 130 kg, and say that eating protein powder exercises muscles. So I don't think this problem is big. Now one is growing, and the other is that high school students sleep less and exercise less, which is not the time to gain weight. I'm sure I will get fat in the future, especially after I stop growing. As long as I'm not sick, I'm not afraid now. If you want to gain weight now, you can exercise your muscles, eat more high-calorie and high-protein foods, eat some biscuits and drink some milk before going to bed at night.