Chris Hemsworth Reveals Dramatic 'Heart of the Sea' Weight Loss

Chris Hemsworth at the premiere of 'Avengers: Age of Ultron'

The 'Thor' star reportedly had to limit himself to 500-700 calories a day for a few weeks.

Chris Hemsworth may be known for his role as the muscular superhero Thor, but the Avengers star had to slim down dramatically for his upcoming role in Ron Howard's In the Heart of the Sea.

The actor showed off the gaunt, ship-wrecked look he sports for part of the film on Instagram on Sunday, joking in the caption, "Just tried a new diet/training program called Lost At Sea. Wouldn't recommend it ... "

In the photo (embedded below), Hemsworth sports a full, ragged beard and cuts on his chest and face, which also has a reddish tint. His ribs are also visible on his frail physique.

In the film about the sinking of whaling ship the Essex, the true story that inspired Herman Melville to write Moby Dick, Hemsworth plays first mate Owen Chase. In the Heart of the Sea is also based on Nathaniel Philbrick's book of the same name about the aftermath of the tragedy and how the crew fought to survive.

Trailers for the film, which opens Dec. 11, show glimpses of Hemsworth trying to survive after being shipwrecked, sporting a short beard, but nothing like the scraggly look he revealed on Instagram.

He previously told Entertainment Tonight that he had to restrict himself to 500-700 calories a day for a few weeks for the shipwrecked scenes.

"We have to shoot the really skinny stuff where we drop down to 500, 600, 700 calories a day, a good three or four weeks and it's going to be pretty uncomfortable, but we'll be together in our misery," Hemsworth said. "I spend more time thinking about food than anything else at the moment." 

The role marks Hemsworth's second collaboration with Rush director Ron Howard. He previously talked to The Hollywood Reporter about the dramatic weight loss he had to undergo for Rush, saying "it was pretty brutal."

"My wife [Elsa Pataky] was pregnant at the time and I had more symptoms of a pregnant woman than she did. I was moody and hungry all the time," Hemsworth said. "I understood addiction for the first time, to be honest. I immediately knew what it is like to be truly at the mercy of something. Literally, food was the last thing I thought about before I went to bed and the first think I thought about when I woke up. I ate very little protein and carbohydrates. And then I'd just run to sweat it off."

 

Just tried a new diet/training program called "Lost At Sea". Wouldn't recommend it.. #IntheHeartoftheSea

A photo posted by Chris Hemsworth (@chrishemsworth) on

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