It is an extreme measure, but it seems some people just cannot control their weight. There's a massive industry offering solutions. I'm lucky not to need them. I like some food treats, but I think I eat well in general and the exercise must help. We only get this one life and have to live it well. You have to enjoy it, but that does not have to mean constant junk food. I hope your friend gets on a better path after this.
!BEER