Some actors go through excruciating lengths to drop pounds for roles, almost to the point of unhealthiness. Matt Damon, however, lucked out when it came to 'The Informant!' as he was asked to pack on 30 pounds for the goofy role. The actor, probably best known nowadays for his chiseled, bone-snapping 'Bourne' roles says he had "probably the funnest time" he's ever had working while filming 'The Informant!,' saying he loved not having to go to the gym after work. "I just ate everything I could see," Damon tells PEOPLE.

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Celebrity Movie Diets
Matt Damon's scrawny 'Good Will Hunting' days (right) went to see about a girl, as the actor packed on 30+ pounds (and a purposely terrible mustache/hairpiece) for 'The Informant!'
X17online / Getty Images
X17online / Getty Images

Celeb Movie Diets

    Matt Damon's scrawny 'Good Will Hunting' days (right) went to see about a girl, as the actor packed on 30+ pounds (and a purposely terrible mustache/hairpiece) for 'The Informant!'

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    Actor Brendan Fraser sports a big belly while in Boston to film his new movie, 'Furry Vengeance.'

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    Fergie of Black Eyed Peas gained 13 pounds for her role in Rob Marshall's upcoming film 'Nine.'

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    Christian Bale shed 63 pounds to play the lead role in 'The Machinist.'

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    Actor Jared Leto was barely recognizable after he put on 60 pounds to play John Lennon's killer, Mark Chapman, in the movie 'Chapter 27.'

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    When Robert De Niro starred in 'Raging Bull,' he gained a record 60 pounds to play the older Jake La Motta.

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    Actor Russel Crowe purposely packed on 63 lbs. for his role in 'State of Play.'

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    Charlize Theron put on 25 pounds for her role in 'Monster.' The 5-foot-nine actress weighed in at 160 pounds during filming.

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    Jake Gyllenhaal gained weight (and lots of muscle) for his role in 'Jarhead.'

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    Singer and actress Beyonce Knowles gained 20 pounds to play Etta James in 'Cadillac Records.'

    Getty Images / Sony