9. Christian Bale
If you were going to crown anyone the kind of method acting and losing weight in order to get ready for a certain role, then it would definitely have to be Christian Bale. Of course, he is very muscular and toned when he is playing Batman, but when a role calls for a different body type and look, Bale is always ready to make the sacrifice.
He is most famous for his amazing transformation for the movie called The Machinist. His weight plummeted to an unbelievable 122 pounds for the role. In order to do this, he said that he hardly ever ate, but that he did take supplements to make sure that he was getting the vitamins and minerals that his body needed. But for someone who is six feet tall to weigh 122 pounds, that is really incredible.
And this was not the only time he did this. He also had to lose a lot of weight for his role in The Fighter, for which he won an Oscar.