Wow, I just saw a picture of Christian in The Machinist. He got down to 120 pounds by only consuming an apple and a coffee a day. Apparently his character in the film has an eating disorder and insomnia. He also only slept two hours a night to prepare for the role. It is kinda scary to see him like that and think of what he was putting himself though. Gotta be one of the most dedicated actors of our generation though. Not many rich actors would deprive themselves like that for a role.