Zac Efron dieted for his Baywatch role with pizza and cheeseburgers...just kidding. (You wish!) In reality, he ate ultra healthy for a transformation that took only 12 weeks. “I implemented an all-organic whole-food diet,” says his trainer, Patrick Murphy.

Efron also supplemented with whey protein—“unflavored,” adds Murphy, who also stipulated it could contain no other ingredients (NOW Whey Protein Isolate is a good example). “He also hit a minimum of 100 ounces of water daily.”

Murphy won’t disclose specifics but says he had Efron change his caloric intake about every two weeks, along with his breakdown of protein, carbs, and fat. “My tweaks worked like a charm,” he says. No kidding.