Some stars go to great lengths to get into character. Matthew McConaughey, Anne Hathaway, Renee Zellweger, and Christian Bale are just a few of the many celebrities who've lost or gained significant amounts of weight for movies
Christian Bale in The Machinist
The Dark Knight Rises star made headlines in 2004 for losing an incredible 63 pounds to play emaciated insomniac Trevor Reznik in 2004's The Machinist. "Interestingly, I did find that mentally it was very, very calming being that skinny, because you really didn’t have any energy for expending on unnecessary things, so you just kept it simple," he told MovieWeb of withering down to 121 pounds. "Life became very simple."