Chris Hemsworth's chiseled, muscular body in "Thor: The Dark World" is soon going to be a thing of the past.

The actor has to lose a lot of weight for his next movie, "Heart of the Sea," and is consuming just 500 calories a day to do it! The film is based on a true story that inspired Herman Melville to write "Moby Dick."

"A bunch of sailors in a whaling ship get struck by a whale, the ship sinks and they jump onto the small rafts and drift for 90 days. And basically they begin to die and eat each other ... a romantic comedy," Hemsworth joked on "Jimmy Kimmel Live."

"And we have to get rather skinny. So we're on 500 or 600 calories a day."

Hemsworth is used to dieting for roles; he dropped 30 pounds to star in the Formula One drama "Rush."

So, just what can someone eat that totals 500 calories? "I mean, you can consume 600 calories in a milkshake," he noted. "So it ends up being a couple of small salads, a couple of small pieces of protein and that's kind of it and you go to bed hungry. And then you have like a fasting period of 15 hours, like you stop eating completely, and then you have little meals through the day."

Being a movie star is hard work!

[h/t Huffpost Entertainment]
Thor: The Dark World Movie Poster
Thor: The Dark World
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