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.