How can a 13 year old boy lose weight?
Try low carb, low fat, high fibre, high protein, and exercise. The foods are low caloried, and yet filling and healthy. My son is 12, 5’5 and weighs 125 lbs. He is on a similar diet as me, with more complex carbs for his high energy needs. It is my lifestyle now. I am on low carb, low fat, high fibre, high protein and a hour brisk walk 5 times a week, and I have lost 31lbs/14kg and gained better health. I am now maintaining my 108lbs/49kg for more than a year, with more fruits and complex carbs. Details such as my experience, meals, recipes, foods to buy, reading labels, walking as an exercise and to shape the body etc etc, are in my blog.