Adolescence brings specific nutritional needs linked to the accelerated growth that occurs during this stage of life. Calorie requirements, as well as needs for protein, vitamins, and minerals, increase, necessitating a diet particularly rich in dairy products, meat, fish, or eggs, fruits and vegetables, and starchy foods, while limiting intake of fats, sugary foods, and sugary drinks. The frequent consumption of these items is of particular concern to public health authorities, as it is on the rise and contributes to the increase in obesity, particularly among adolescents. The rise in overweight and obesity has indeed been a trend observed across all age groups in France for several years. Among adolescents, the prevalence of obesity ranges, according to surveys, between 2% and 4%. Several studies have shown a recent stabilization among children and 9th-grade adolescents. Nevertheless, obesity that develops during childhood or adolescence is likely to persist into adulthood. In light of these findings, public health policies have, for several years, recommended certain measures targeted at adolescents. The promotion of a healthy diet and the fight against obesity are objectives advocated by public authorities in several public health plans: the National Nutrition and Health Program (PNNS), launched in 2001 and set to continue through 2015, and the 2010–2013 Obesity Plan. [excerpt from the chapter introduction]