TWILIGHT star Taylor Lautner was forced to cut back on exercise to bulk up for the vampire movie's sequel NEW MOON - he was working out so hard he lost weight instead of gaining it.
The 17 year old's character Jacob Black has a much bigger part in New Moon than in the first film, so he hit the gym as soon as shooting wrapped on Twilight.
The star bulked up with two-hour workouts seven days a week - but the punishing regime soon took its toll on Lautner.
He tells Interview magazine, "I had put on a lot of weight, and then I started losing it drastically, so I was worried. It turned out I was overworking myself. My trainer told me that I couldn’t break a sweat, because I was burning more calories than I was putting on."