Juju Chang looks at a four-step diet that has already taken Europe by storm.
For more on this story, go here: http://abcnews.go.com/Health/dukan-diet-kate-middleton-linked-high-protein-weight/story?id=13404369
For the Full ‘GMA’ Episode, go here: http://abcnews.go.com/watch/good-morning-america/SH5587637/VD55122724/gma-419-extreme-grooming