Some of the greatest performances of all time are when an actor so totally commits to the role that they're willing to destroy their body for it. Robert De Niro as Jake LaMotta in Raging Bull
is the ultimate example. More recently, Christian Bale lost a sickly amount of weight for the machinist
, Matt Damon put on the pounds for Courage Under Fire
and The Informant!
, Renee Zellweger gained weight for Bridget Jones's Diary