Jared Leto suffered with gout after putting on weight for 'Chapter 27'.

The 42-year-old actor had to gain 67 lbs for his role of Mark Chapman - the deranged fan who assassinated John Lennon - in the 2007 biopic, but he has vowed never to pile on the pounds for a movie again because he doesn't want to put his health in jeopardy.

He told The Guardian newspaper: ''Really, it's a stupid thing to do. I got gout, and my cholesterol went up so fast in such a short time that my doctors wanted to put me on Lipitor, which is for much, much older people. Again, though, a fascinating journey.

''I had some reservations because I love everything John Lennon ever did. But in the end I wanted to explore a specimen embodying the total failure of humanity, just walk down this brutal path again.''

However, the 30 Seconds To Mars singer - who has been nominated for the Best Supporting Actor Oscar for his performance in 'Dallas Buyers Club' - didn't have too much trouble trying to shift the extra pounds as his active lifestyle on tour with his rock band helped him shrink back to his previous weight.

He explained: ''I lost a lot of it by going on your, not straight away, but I was still kinda waddling around on stage for the first few dates, and eventually it came back off, thank God.''