In July 2011 a French court ruled against Dukan in his attempt to sue rival nutritionist Jean-Michel Cohen for libel, after Cohen had criticised his method in the press [REF].
In 2013, Dukan, then aged 72, was banned from practising as a GP in France for eight days for breaching medical ethics by prescribing a diet pill to one of his patients in the 1970s that was later pulled from the market [REF].