This publication is a derivative product summarizing the global, evidence-informed recommendations and principles of the World Health Organization that address malnutrition in all its forms in adolescents with the aim of ensuring healthy lives and well-being among this group. The purpose of this publication is to facilitate the implementation of existing WHO guidelines on nutrition-specific and nutrition-sensitive actions required for improving health and well-being of adolescents. Implementing these actions should explicitly take into account the heterogeneity of adolescents in general (for instance, in their state of physical growth and social development), as well as the diversity within their country (for instance, in terms of the expected responsibilities in the family, the number out of school or out of work and existing social norms). In addition, designing and implementing programmes to address adolescent nutrition should allow adolescent participation in governance, programme design, implementation, monitoring and evaluation.