According to the World Health Organization (WHO), obesity has reached epidemic proportions worldwide, leading to an increase in associated chronic diseases. Consequently, it is necessary to promote public health policies to reduce this phenomenon. This is one of the objectives of the National Nutrition and Health Program (PNNS), established in 2001 by the Ministry of Health. This article describes changes in body weight among children and adults (ages 6–74) in France between 2006 and 2015 based on two national cross-sectional studies using a three-stage probability sampling design: ENNS-2006 (N=3,566) and Esteban-2015 (N=3,702). Anthropometric data were measured using standardized procedures in accordance with WHO recommendations. The 2006–2015 comparison indicates that the prevalence of overweight and obesity in France remained stable among adults and children. In 2015, among adults, the prevalence of overweight (including obesity) was 54% among men and 44% among women, and obesity reached 17%, with no change over the past 10 years (prevalence of overweight = 49% in both studies). In 2015, among children, this prevalence was 16% among boys and 18% among girls, with no significant change since 2006. The prevalence of underweight increased significantly, reaching 13% in 2015. Despite having stabilized over the past 10 years, the prevalence of overweight and obesity remains high, requiring ambitious public policies to reverse the trend and reduce its health impacts.