Chris Pratt hopes his six-pack can save the universe in ''Guardians of the Galaxy''; we look back at others -- including Matthew McConaughey, Christian Bale, and Charlize Theron -- who reshaped their bodies to play a part
Gained weight for: American Psycho
Lost weight for: The Machinist
Though his most dramatic physical feats came in the form of American Psycho's body-obsessed Master of the Universe Patrick Bateman (left) and The Machinist's haunted insomniac Trevor Reznik (for which he lost 63 pounds; right), those films didn't do big box office. It was another thinnification a 30-pound drop to portray real-life boxer-turned-heroin-addict Dicky Eklund in 2010's The Fighter that netted him an Oscar and proved that, from Batman to Bateman, there's Method to Bale's madness.
Image Credit: Kerry Hayes; Nicholas Geller