The X-Men star — who has been confirmed to reprise the role in Deadpool 3 — rose to fame as the muscly mutant he played for 17 years, appearing in nine Fox franchise films as the comic book anti-hero before he was killed off in 2017 movie Logan.
Jackman, 54, was asked on HBO’s Who’s Talking to Chris Wallace if he had ever taken steroids to get into shape for the part.
He said: “No, I love my job. And I love Wolverine. I got to be careful what I say here, but I had been told anecdotally what the side effects are of that. And I was like, ‘I don’t love it that much.’
"So no, I just did it the old school way. And I tell you, I’ve eaten more chickens — I’m so sorry to all the vegans and vegetarians and to the chickens of the world. Literally the karma is not good for me. If the deity has anything related to chickens, I’m in trouble.”
The Australian Broadway star also confessed his embarrassment on the first X-Men movie after he studied wolves to try and get into character.
Jackman revealed: “I had never read the comic book I got the part. I didn’t really know anything about… I didn’t, in Australia we don’t have wolverines. I didn’t know that was a real animal. I’d never heard of a wolverine.
"I thought it was a made-up animal. You know, like, he’s got man hands of steel, made up. And so I was passing as I was doing rehearsal at the IMAX, they had this documentary about wolves. And I was like, perfect, because obviously I’m a wolf, part wolf.
“So I went [to set] with all these wolf moves and I was doing these moves, and the director said, ‘What are you doing?' And I said, ‘Well, I was just thinking wolves are always looking like this because they’re actually smelling, they’ve got their nose to the ground.
"That’s why they’re looking like this all the time.’ And he goes, ‘What do you mean a wolf?’ And I said, ‘Well, you know, Wolverine — I’m part wolf so…’ and he goes, ‘No, you’re a wolverine.'”
Watch: Hugh Jackman's fitness regime to become Wolverine again