The aim of this prospective study is to evaluate the frequency of the obesity in the population of 951 children aged between 6 and 12 years old, scholarized in two primary schools situate in ArianWe found 50 obese children between them (5.25%). The weight and the height of these children were more than 3 standards deviations compared to the normal. 66% of these children have one or two obese parents and 74% were the oldest or the youngest child in the family. The food intake was more important than the normal and it was hyperglucidic rich in sugar and hyperprotidic with troubles of dietetic comportment