Hugh Jackman is scared he's going to suffer a "heart attack". The actor - who stars as the titular character in superhero spin-off 'The Wolverine' - admitted the diet he has to stick to when he gets in shape for the role worries him because he knows it's "not good". He said: "It's not good for me to eat 6,000 calories a day. I have to eat a dozen eggs every day. The only way [varying the diet] works is eating chicken. "I know there are vegan body builders but chicken is what works for me. Lots and lots of chicken ... I worry I'll have a heart attack." The 44-year-old star has to undertake a huge workout regime - which he hates - every time he plays the mutant and he admitted he thought people pushing themselves so hard for a similar goal were "idiots". He added: "I used to go to the gym and see these guys pumping iron and I thought they were idiots. In what situation could you need to bench 350 pounds? I never understood the addiction, it's just painful. But that's what I do to become Wolverine."