26 March 2012 Last updated at 11:50 ET
The founder of the controversial Dukan Diet, Dr Pierre Dukan, faces an ethics hearing after suggesting children could pass a new exam by staying thin.
The French College of Physicians says he breached medical guidelines that say doctors must consider the impact of their comments on the public.
He faces a disciplinary hearing within six months, and could be struck off.
His diet, said to be followed by some celebrities, recommends avoiding starch and carbohydrates.
Some nutritionists say it can be dangerous.
In January, Dr Dukan sparked controversy in France when he said the Baccalaureate exam should include a new anti-obesity option, which 17-year-old children would pass just by staying within recommended weight guidelines.
The College of Physicians said this could have a negative impact on young girls who are already overweight or anorexic.
The College said in a second complaint that Dr Dukan was focused more on commerce than medicine, in breach of a part of its code that says medicine must not be practised like a business.
And the body also said his best-selling diet books meant he was neglecting medicine.
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Dukan diet guru on ethics charge
