The big business of Gluten-free food.
A recent study shows that a lot of people who believe they are sensitive to gluten actually aren't.
In fact, many people on a gluten-free diet don't even know what diet they're on.
The gluten-free food industry is a $10 billion business and it's expected to grow 50% by 2016.
But is it all a big joke?
OutFront, Dr. Mark Hyman is the medical director and founder of The UltraWellness Center. He helped President Clinton find a healthy lifestyle after a 2004 quadruple bypass surgery.