The Season 5 runner-up, Katharine McPhee, lost 30 pounds and three sizes! How?

Following Intuitive Eating, a program that helped McPhee beat the obsessive eating patterns at the root of her five-year battle with bulimia, for which she sought treatment in October 2005.

“I’ve gotten pretty good about it…dealing with food,” the 5-foot-8 singer, 22, tells Us Weekly.

“I’m not controlling my weight anymore.” “Casting directors [told me to lose] 10 more pounds,” McPhee has said.

Katharine McPhee’s Diet

“I eat what I want – pizza, pasta with marinate sauce, ice cream, bread – but now I pay attention to how I feel while I’m eating,” the Los Angeles native, who avoids red meat but loves Snickers, told Shape magazine of her adherence to the Intuitive Eating plan.

“When I’m full, I stop.”

Katharine McPhee’s Workout

“Last year, truthfully I had not tome work out,” the singer has said. “All I want to do now is get on a treadmill for 45 minutes four or five times a week and do weight training.”

Take-away Tip

Choose inspiring workout music to keep you moving! McPhee’s faves: Sheryl Crow’s “Strong Enough” and Kanye West’s “The New Workout Plan.” McPhee eats what she craves, but stops when full. [source: Us Weekly]