Some actors will do just about anything to make sure they look the part for their upcoming movie roles. Here are a few celebrities that either bulked up or trimmed down to help get into character.

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Kellan Lutz's 'Immortals' Diet

When Kellan Lutz was playing the role of Poseidon in Immortals, he had to look the part of a Greek God. The actor said he bulked up to 220 pounds by eating 16 eggs every day.

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Ryan Gosling's 'Only God Forgives' Diet

Ryan Gosling is currently in Asia filming Only God Forgives, in which he plays a Thai boxer. To help prep for the role, Gosling has been on a Thai food diet of fish, veggies and rice.

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Kate Beckinsale's 'Underworld: Awakening' Diet

To get back in her catsuit for Underworld: Awakening, Kate Beckinsale went on the 321 Nutrition Plan. The diet includes three meals, two snacks and a liter of water every day.

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Daniel Sharman's 'Immortals' Diet

To prepare for his role as Ares in Immortals, Daniel Sharman was on a diet that consisted of turkey slices, shrimp and protein shakes.

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Tom Cruise's 'Mission: Impossible' Diet

To reprise his role as Ethan Hunt in the latest Mission: Impossible installment, Tom Cruise had to make sure he was in shape for all the stunts. He put himself on a diet of tuna and macrobiotic drinks.

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Amanda Seyfried's 'In Time' Diet

To get ready for her role in the action flick, In Time, Amanda Seyfried went on the 5 Factor Diet. The plan includes 5 meals a day, each of which should include low-fat protein, healthy carbohydrates, fiber, healthy fat, and a sugar-free drink.

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Blake Lively's 'Green Lantern' Diet

When Blake Lively was preparing for her role in Green Lantern, she chose a diet regime that would work for her healthy lifestyle. Her diet included lean proteins, blended juices, and healthy fats.

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Adam Rodriguez's 'Magic Mike' Diet

Adam Rodriguez plays a male stripper in the upcoming Magic Mike. To get his body ready for the role, Rodriguez went on a diet that consisted of 350-400 calorie meals of lean proteins and complex carbs.

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Russell Crowe's 'Superman' Diet

Russell Crowe is shedding the pounds for a role in the upcoming Superman movie. His diet consists of 2400 calories a day, with as many gluten-free foods as possible.