Steve Tyler is terrified of getting too fat to fit into his leather pants. The Aerosmith frontman is permanently on a diet because he loves being skinny, and is fearful of putting on weight as he gets older.

Steve, 59, said in an interview with the Sunday Times magazine: "I have to watch what I eat because I have this ongoing nightmare that I'm going to put on weight and end up looking like some of the other rock stars of a certain age who bounce around the stage.

"You look at them and think, 'Oh my God, what happened to you? How did you let yourself get like that?' I always call Joe Perry, my bandmate, and say, 'Do you still weigh 145 pounds?'

"For God's sake I still want to be able to fit into those pants I wore on the last tour. I just live by the motto that nothing tastes as good as being thin feels."

The svelte rock star watches what he eats while on tour and does "250" sit-ups every night before bed.

He said: "I don't eat regularly during the day and in the evening I tend to stick to wild salmon and broccoli. Every night before I get into bed, I do 250 sit-ups - religiously."

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