Popular diet expert Pierre Dukan, whose books have sold millions around the world, has written an open letter to the future president of France with advice on how to curb the country’s obesity problem.

One of Dukan’s proposals is that pupils preparing for the Baccalaureat exam should be able to gain extra marks by sticking within a specified body mass index range.

The Baccalaureat is the end of school exam taken by most 18-year-olds in France.

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