Anthony Mandler/Men s Health
Michael Y. Park
November 10, 2009 12:10 PM

Taylor Lautner‘s transformation from skinny teen to hunky werewolf didn’t just happen with a full moon – the actor had an exacting regimen to achieve his famously shirt-bereft physique.

“I was exercising so hard that I began to lose weight,” the 17-year-old tells Men’s Health in its December issue, out Nov. 17.

For most people, that’d be a good thing. But for Lautner, who wants to bulk up even further as the Twilight film series progresses, he had to go on a 3,200-calorie-a-day diet to put on mass.

RELATED: Kristen Stewart: Taylor Lautner Grew Up During New Moon
“My character continues to grow, so I d like to pack on at least a few more lean pounds,” he says.

Whatever he’s doing, it’s working. Kristen Stewart had only good things to say about her costar’s seeming makeover.

Taylor Lautner

“He’s literally become a different person,” she said. “He’s just grown up.”

How to Get Taylor s 6-Pack Abs

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