Liam Hemsworth on His 'Hunger Games' Diet

Liam Hemsworth, Jennifer Lawrence and Josh Hutcherson attended the New York City screening of The Hunger Games last night, where the close-knit trio dished about their intense preparation for one of the most highly anticipated films of the year, as well as their off-screen friendships.

"There weren't too many stunts or fighting in this one for my character, but my character lives in District 12, which is the poorest district, and I had to lose quite a bit of weight for it," Hemsworth revealed.

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And what did he splurge on when given the opportunity?

White Castle fast food with close pal/co-star Josh Hutcherson!

"When we were shooting the film, actually, me and Josh went to Kentucky. He's from Kentucky. And we had a few days off from shooting and we decided to get White Castle which I'd never had before, and then we played basketball after eating the White Castle and we threw up a little bit so yeah, that was interesting," he laughed.

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Hutcherson himself expressed admiration for Lawrence, whom he admitted would probably win in a Man vs. Wild-type competition.

"She's had the most training out of all of us. She could be deadly with a bow and arrow," he joked. "She could do some damage. ... she's very fierce."

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The photogenic co-stars have obviously formed close bonds, evident by the amount of fun Lawrence said they have just traveling together.

"We all get really hyper in the beginning, and then we all get tuckered out and fall asleep at the same time, so we're kind of a great group to travel with in a way," she joked. "I mean, I love traveling with the boys. It's so fun just to get back with them again. It's just been a blast -- all of it."

Check out the video to hear why Lawrence feels like a "fish out of water" dressing up for red carpets, and why NYC is one of Hutcherson's favorite cities.