Christian Bale is in that latter camp, a guy who’s famously lost and gained large amounts of weight about a bajillion times now.
Bale most recently transformed his body for Adam McKay’s (still untitled but probably called Backseat) Dick Cheney biopic.
I’m seriously starting to believe Bale has a real-life Prestige twin he keeps hidden somewhere and recruits to play his skinnier roles.
The interesting thing is, for a moment there it looked like Bale was calling it quits on this whole insane-and-definitely-not-healthy transformation thing.