[Why and how to use the new body mass index curves for children]

Body mass index (BMI) curves are very useful tools to supervise corpulence during growth and to detect children at risk of overweight and obesity early. In 2009, the French National Nutrition Health Program decided to update the BMI curves used in France. A working group was then created, coordinated by the committee on nutrition of the société française de pédiatrie and by the association pour la prevention de l'obésité en pédiatrie. This article discusses the criteria adopted in elaborating the new curves among the existing references and curves (French references, the International Obesity Task Force [IOTF], the World Health Organization [WHO] standards). It presents recommendations for using the new curves and the BMI values used to define weight insufficiency, overweight, and obesity according to the references utilized.