A packed lunch, which a child takes to school, is, contrary to appearances, a very important position in his daily menu. A sandwich with lean meat and vegetables, as well as fruits will provide young people with the necessary energy, improve well-being and allow them to concentrate on learning. Eating innutritious, sweet snacks on an empty stomach or allowing for long hours of breaks between meals are bad habits that can upset metabolism, lead to evening hunger pangs and even to eating disorders in the future.