From Details magazine:
Just over a year ago, Schreiber was “smoking a pack and a half and drinking my nuts off” on a Broadway stage eight times a week in a blistering, virtuoso performance in Eric Bogosian’s Talk Radio. Then he was cast as Sabretooth, the supervillain in this summer’s X-Men Origins: Wolverine, opposite his friend Hugh Jackman. (”The very large and very muscular Hugh Jackman,” he says.)
“I started to read blogs in the comic world with things like ‘That’s the dumpiest, most out-of-shape Sabretooth I’ve ever seen in my life!’” he says. “They gave me a muscle suit at the beginning. I was so humiliated I thought, I’ve got to try to do this on my own.” Jackman helped him train, putting him on a diet so poultry-intensive that Schreiber jokes they were becoming “the Hitler and Mussolini of the chicken world. But I felt like I owed it to the genre to be big.”
Source: filmonic