Jimmy Mohamed is the author of a book called "Zero constraints to lose weight, 39 tips" The French doctor says that long-term diets, in reality, are not effective. He says that four out of five French people who lose weight will gain weight.

The real difficulty is not to take back what you have already lost, he says. He suggests that you should not be ready for the summer but rather for the rest of your life. For him, removing the sugar in its entirety as well as all the delicacies from his cupboard is not the solution.