That’s difficult. One of my brothers was like that. He’s now 6’2. He was overweight when he was younger, but slimmed down as he grew older and taller. Many teens and young adults can eat whatever they like, particularly if they’re involved in sports. My mother had a tough time keeping food in the house. My brothers could eat a loaf of bread in no time at all.
We have the tall, skinny one, and the even taller, heavy one, and the small ones, like army ants. They eat amazing amounts. I just figure they’re all growing taller, while I’m not, so they can have more.