Christian Bale
Christian Bale is no stranger to changing his appearance for films. When he was at his absolute lowest, he dropped 60 pounds for his role in The Machinist. To some, this might not sound like it's that big of a deal. But, when you consider that he was 173 pounds, and he dropped to 110 for the role, the act sounds a bit more ridiculous.
Just a Little Perspective
When he was training for The Machinist, Bale exercised regularly and intensely. He ate one can of tuna, one apple, and had one cup of coffee a day. Between the lack of calories and the extreme exercise, Bale was able to get his weight down over the course of eight months.