Losing weight can't just control diet. Even losing weight is unhealthy, which will cause your current phenomenon. Losing weight is not to lose weight, but to lose fat. You must reduce the body fat, so that you can be healthy. Therefore, if you want to lose weight, you have to exercise and control your diet to get healthy results. Exercise also needs aerobic exercise and anaerobic strength training to form a good and beautiful figure. My arm is thin because I didn't practice arm strength training. Practice your arms more, and your arms will gradually thicken. Chest hypertrophy is the strength training of doing push-ups or bench presses. You should also pay attention to aerobic exercise and reduce body fat, which will not happen. In terms of diet, we should eat more foods rich in protein, such as eggs, chicken breast and beef. And eat more fruits and vegetables, eat less high-calorie foods, such as fat and sweets, and eat less carbohydrates, which is enough for one day's energy consumption.