He packed on nearly 10kg of muscle for his leading role in Thor and Thor: The Dark World, but now Chris Hemsworth is determined to lose the extra pounds for an upcoming film project.
Eating the equivalent of one milkshake a day (between 500 to 600 calories), the 30-year-old determined to become “scrawny” for Ron Howard’s new film Heart of the Sea.
“[The movie] is the true events that inspired Herman Melville to write Moby Dick,” he explained to US talk-show host Jimmy Kimmel.
“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.
“[It's] a romantic comedy,” he added, with a smile.
Compared to his diet on the Thor movies – which consisted of 3500 calories a day, mostly vegetables and protein – this radical weight-loss programme will be hard for the star.
“It's funny, you've never heard 15 big, burly guys playing sailors talk about their calorie-count, what they should and shouldn't eat, what their cheat meal is going to be,” he said of the new regime.
Heart of the Sea is scheduled for a 2014 release date.