Diet guru calls for schoolchildren’s fat to be graded

In a book to be published on Thursday, Dr Dukan suggests that students in their last two years of high school be awarded extra marks if they manage to maintain an acceptable BMI.

"Obesity is a real public health problem that is rarely – if at all – taken into account by politicians," Dr Dukan told newspaper Le Parisien ahead of the book's launch.

Dr Dukan said his education plan would be "a good way to sensitise teenagers to the need for a balanced diet."

He denied it would punish overweight children, saying: "There is nothing wrong with educating children about nutrition.

This will not change anything for those who do not need to lose weight. For the others, it will motivate them."

The book is entitled An Open Letter to the Future President and is being released ahead of a presidential election in France in April.

The country has taken a series of measures to fight what experts say