Chris Hemsworth
Our buddy Chris didn't always look like Thor in his later career. He became bone-skinny when he played First Mate Owen Chase in Ron Howard's In the Heart of the Sea. He lost 30 pounds over the course of filming, and evidently, that was pretty easy for him...
Just Like Castaway
Hemsworth and his mighty gang of swashbucklers all dieted at the same time. They all consumed only 500 calories per day so they could show all of their gradual descent into starvation. But, he and the crew began losing their minds as their weight loss became more and more extreme. They went nuts weighing themselves every day, and they got aggressive and snappy with one another. Being hangry is a real thing.