Jean-Michel Cohen, French nutritionist, explains that the Dukan diet is not healthy and can be dangerous.

Dukan Diet Under Fire by Rival Doctor

June 2011

The doctor who created the popular diet is fighting claims that it is dangerous.

For more on this story, click here: http://abcnews.go.com/Health/dukan-di...

For the FULL 'GMA' Episode, click here: http://abcn.ws/l6JqGu

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