Hazing Week: 8 Male Actors Who Drastically Lost Weight For A Movie Role

You didn't even recognize the rapper formerly known as Curtis Jackson, did you? That's because Fiddy dropped 50 pounds to play the main character, based on his childhood best friend: A promising college football player who succumbs to cancer.

Oh, and Curtis co-wrote this movie. Just watch the trailer--you're gonna wanna see it.

Here are the numbers: To play a heroin-addicted soldier, in 1996 Matt spent 100 days losing 40 pounds, for only two days of actual shooting. His crash diet was so intense that it cause damage to his adrenal gland and he had to have medical supervision for several months after.

Tobey has no qualms about dropping and gaining weight for roles. In fact, the most startling thing about his weight loss for Seabiscuit (20 pounds in a month) was that only six weeks later shooting started up for Spider-Man 2, so he had to bulk up with no time to spare.

To play Chris McCandless, who starved to death in the wilds of Alaska, Emile went through a pretty intense weight-loss regimen that started three-quarters of the way through the shooting of Into the Wild. Although he wouldn't comment much on how he lost the weight--citing diet and exercise--he called it "depressing."

Another druggie--according to IMDb, the producers put Ewan on a strict diet of no alcohol and no dairy products. After that, it took only two months for him to reach heroin chic size.

To play the titular masked hero, Seth dropped a ton of weight, going from chubby funny guy to suave funny action star. And not to be a jerk, but it was probably best for his health, as well.

Before he got famous, Michael starred in Hunger, a biopic about Bobby Sands' 1981 hunger strike. Pre-shooting, he had ten weeks over the Christmas/New Year's holiday, and this is how reporters described his process: "long walks, a Jerry Hall yoga DVD left by his house's previous renter, and a very small tin of sardines every evening."

This is never going to stop being the stuff of nightmares. Christian starved himself so he would resemble a paranoid machinist who suffers from insomnia and is the most emaciated male character we've seen on-screen.