If you’re familiar with Chris Hemsworth of Thor fame (also Sexiest Man Alive in 2014), then you know that he’s a big, muscular guy. Not so anymore, it seems.
Hemsworth posted a photo to Instagram, showcasing some pretty major weight loss:
But don’t worry, Hemsworth fans — it’s all for a movie role. Titled In the Heart of the Sea, the movie takes place in 1820 and follows the doomed crew of the whaling ship Essex after an attack by a massive whale; if it sounds familiar, it’s because it’s based on the true story that inspired the classic novel Moby Dick.
The Aussie actor, 32, had to get down to skin-and-bones for the shipwreck scenes, and in order to do that he restricted himself to as low as 500 calories a day.
WATCH: David Beckham on being Sexiest Man Alive
We’re sure he’ll be back to his old buff self in no time.