"<b>Taylor Lautner: ""Twilight""</b><br />To transform into Jacob the werewolf in the ""Twilight"" series of films (in which he's often shirtless), Taylor Lautner, 21, had to gain 30 pounds of muscle through intense workouts and a strict diet, which helped him really bulk up. ""I was forcing myself to eat thick, heavy food every two hours,"" he told USA Today in 2011. ""That was really tough for me. Three protein shakes a day. Ugh, I hate that thought."""
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