I don’t know if I want a drug to exist that allows people to be gluttons without consequence. It’s like a modern (and real) vomitorium.
A vomitorium is simply the large exit pathway in stadia for rapid egress of many people. The idea that ancient Romans had facilities dedicated to vomiting has been debunked.
Those people that tell you they can eat anything and not put on weight have a very different idea of what "anything" is than fat people, with probably an actual exception here and there (along with teenagers).