The Dukan Diet, also known as the princess diet, is a diet plan originating in France. It is a protein-based diet designed by French doctor Pierre Dukan. Although Dukan has been promoting his diet for over 30 years, it gained greater popularity after publication of his book in 2000. His book The Dukan Diet has sold more than 10 million copies globally. The book has since been translated into 14 languages and published in 32 countries. The Dukan Diet was released in the United Kingdom in May 2010, and in the United States in April 2011. source:wikipedia