From the mighty Thor to a shipwreck victim at the mercy of the seas, Chris Hemsworth is but the latest in a long line of actors quickly gaining and then shedding large amounts of weight for roles. 

The 30-year-old, currently starring in the Marvel flick "Thor: The Dark World," told host Jimmy Kimmel that filming for Ron Howard's drama "In the Heart of the Sea" is proving to be a big challenge physically.

"It's the true events that inspired Herman Melville to write Moby-Dick. A bunch of sailors on a whaling ship get struck by a whale, the ship sinks, and they jump onto some small rafts and drift for 90 days and, basically, begin to die and eat each other - a romantic comedy," he quipped. "And we have to get rather skinny. And we're on about 500-600 calories per day."
 

Hemsworth admits that he likes to cheat once a week with something like a pizza - but otherwise, his meals are meager. 

"It ends up being a couple small salads, a couple pieces of protein, and that's about it, " he told Kimmel. "You go to bed hungry and then you have a fasting period of about 15 hours - and then you (once again) have little meals throughout the day." 

Hemsworth joins other actors such as Matthew McConaughey, Jared Leto, and Anne Hathaway who have recently gone to extremes to transform their bodies for roles. 

"I lost the first 10 [pounds] in three weeks through a detox and then I lost the subsequent 15 in 14 days by doing food deprivation and exercise, which I don’t recommend," Hathaway said of her starved look in the film "Les Miserables." 

Check out Hemsworth's interview on "Kimmel" below. 

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