Adolescent nutrition and health: characteristics, risk factors and opportunities of an overlooked life stage.

Adolescence is a pivotal, yet frequently overlooked, period of life, with this age group often no longer receiving the focus, care and protection devoted to other life stages. Nutritional vulnerability increases in adolescence due to heightened nutritional requirements, yet the quality of the diets consumed by this age group often deteriorates significantly. Poor-quality dietary patterns and insufficient nutrient intakes are frequently observed amongst adolescents both in Ireland and globally. This deterioration in diet quality is greatly influenced by individual, social and environmental determinants of behaviour and health. The influences of each of these factors change and increase as adolescents begin to interact independently with the surrounding world. Poor nutrition during adolescence can result in several immediate and long-term health consequences, including micronutrient deficiencies, increased risk of overweight/obesity and increased presentation of cardiometabolic risk factors, all of which have been observed as persistent issues amongst adolescents in Ireland and internationally. Adolescence is a critical period of intervention to protect youth both now and into their future lives. This age group can be particularly receptive to the influence of society and the surrounding environment, posing several avenues in which to influence adolescents towards more health-promoting behaviour. This review aims to summarise the key nutritional and dietary characteristics of adolescents, to provide an overview of the causes and consequences of poor nutrition in adolescence, and to highlight potential opportunities for intervention to protect the health of this age group, with a particular focus on evidence from an Irish context.