"I had about half of one (pizza slice) before I realised I should stop and my stomach had not had dairy or carbohydrates in months and I was making a huge mistake. It was a wonderful minute and a half," his co-star Benjamin Walker added to the New York Daily News' Confidenti@l column, reports femalefirst.co.uk.

Meanwhile, the 32-year-old actor said that he was left feeling "moody" when he had to shed weight.

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"The gaining is fine, you just eat a lot and you lift weights but that was underfed, which led to a pretty moody existence and inconsistent emotions.

You play all sorts of games - if I eat this maybe I don't eat that. The insanity is nuts. In order to do it justice, the story, we had to suffer in some way and we did. In other words, not a whole lot of acting was required. We were desperate," he said.