Hello, I am a boy, 1 m 77 or so, 61. It used to be worse. I think many people are thin because they don't like drinking water. Drinking water can not only lose weight, but also gain weight. Drinking water is very important for regulating the body. In addition, I hope you can match some high-protein things, such as eggs, which have high protein content and conform to the protein composition of human body, and the absorption rate is several times that of milk. The most important thing is to combine exercise. You don't have to go to the gym. Usually you can run at home and do some simple exercise. You can also go to the gym if you can. Pay attention to the combination of work and rest, and it will get better. Don't trust the drugs advertised on TV casually. All drugs are poisonous. I didn't take any medicine. In a few months, I gradually strengthened myself very cheaply. I keep trying to keep my weight at least 75. Finally, have a nice day.