I asume that you mean only the weight loss pill exists? Would that be something like manjaro (inhibiting the desire to eat) or one of the few _actual_ metabolism boosters in existence (which all make you produce insane amounts of heat and have fairly high fatality rates -- not necessarily a bad thing given their other side effects)?

Assuming that's what you mean, reversing has spotty success, but prevention is easy for most men if you can tolerate the side effects. Just take your favorite testosterone-blocker.