In France, obesity is on the rise even among very young children. Can schools help combat this trend? This issue reviews all relevant regulations and takes stock of the initiatives undertaken: efforts to combat a sedentary lifestyle starting in preschool, the distribution of fruit outside of meal times in preschools and middle schools, and older students teaching younger ones about nutrition at a vocational high school... Schools emerge as a key setting for combating the constant exposure to food marketing that children face.