Metallica star Lars Ulrich credits the group's healthy diet and lifestyle for its longevity, insisting all his bandmates eat well and try to live balanced lives when they're not on the road.

The drummer tells Nylon magazine there are never any health-related dramas behind the scenes because he and his rocker pals are all "responsible" enough to look after themselves.

He says, "Fortunately, we're dealing with four people who are responsible enough to take care of what they need to do to be their best, especially physically.

"Nobody goes disappearing for five days or wakes up in gutters at eight in the morning. We stay healthy and in shape. We work out and eat carrots and other strange vegetables."