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 and ...