I'll never really understand the use of surgery in this sort of case. Eating less works. Forcing people to eat less will just make them discover new and exciting ways to sneak food. You can't isolate a food addict from food sources. Food is freely accessible to anyone at all times, because it's one of the most commonly sold items. The only real answer is teaching self-discipline. That's the only thing which will last them a lifetime, and prevent relapse. Especially with someone so young, it's preposterous to presume they cannot learn.