She cut out gluten, right? I think I remember a friend of mine who's coeliac (poor guy ) telling me that.
Whatever she did, it worked. God I wish I had that discipline.
I think Miley has celiac disease too. She's been doing a lot of pilates lately and is on a strict diet. Her trainer had an article on Seventeen magazine before and said that she's eating low-fat protein, veggies, fruits & milk.