We've written before about how celebs gain and/or lose weight for certain roles. It makes their portrayals of characters more believable, but it can't be a good practice for their health. Look at how these celebs changed their bodies for a role:

• Jake Gyllenhaal bulked up for his role in the upcoming film, Prince of Persia, by working out two to three times a day, six days a week. He followed that routine for three to four months, in addition to stunt training for the film.
• Irish actor Michael Fassbender lost 33 pounds in 10 weeks by severely restricting calories -- 900-1,000 calories for the first six weeks, then dropping down to 600 calories a day.
  
• Christian Bale survived mostly on apples and coffee when shedding pounds for his role in The Machinist.
• Robert de Niro packed on 60 pounds for his 1980 role in Raging Bull; by the end of shooting, he was visibly not feeling well.
• Renee Zellweger knows all about putting on extra pounds -- she's done it twice for the Bridget Jones movies. While she admits eating whatever you want many sound fun, she says: "After a week your glucose levels are going crazy. It doesn't feel good."
  

Sure, celebrities may seem to lead glamorous lives ... but a job that requires you to risk your health? As for me, I'm happier just being an average Jane.

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In Anna Faris' new movie, The House Bunny, her clothes are a bit more revealing than the star is used to. In fact, when her character walks into a sorority house her attire prompts someone to state that it isn't a brothel. Faris' character -- sweet, kind, and a little more than ditzy -- states "Oh, I'm not looking to make soup."

To get her body into Playboy bunny shape for the role, Faris had to drop 10 pounds. "It was awful," said Faris. "I had to work out a lot and could only eat certain things. It was the regime of it all that I didn't enjoy." Despite her super-fit frame, Faris was still a bit self-conscious wearing such revealing costumes.

After filming wrapped, Faris put the 10 pounds back on.

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