Why Adolescence Matters

Adolescence constitutes a critical developmental period characterised by rapid somatic growth, profound hormonal reorganisation, and continued maturation of the central nervous system. While the early postnatal years establish the foundational architecture of the brain, neurobiological development extends well into the third decade of life.

During adolescence specifically, the brain undergoes protracted structural and functional remodelling, including regionally heterochronous myelination of white-matter tracts and large-scale synaptic pruning and neural network refinement,  processes that are particularly pronounced in prefrontal and fronto-limbic circuits governing executive function, emotional regulation, and higher-order cognition.²

These maturational processes confer heightened neuroplasticity but also render the adolescent brain uniquely vulnerable to environmental exposures, including suboptimal dietary intake. The quality and adequacy of nutrition during this window directly influence oligodendrocyte biology, neurotransmitter synthesis, and the epigenetic regulation of gene expression, with downstream consequences for cognition, behaviour, and academic performance.¹

Recognising the magnitude of this developmental opportunity, the World Health Organisation has formally identified adolescence as a second critical window for addressing accumulated nutritional deficits and establishing health-promoting behaviours that endure across the life course. ³ This framing carries particular salience in sub-Saharan African and other low- and middle-income country contexts, where adolescents frequently face a dual nutritional burden: the persistence of chronic undernutrition and micronutrient deficiencies, including iron, zinc, iodine, and folate, alongside a rapid nutrition transition characterised by increased consumption of energy-dense, ultra-processed, and micronutrient-poor dietary patterns. The convergence of these challenges during a period of heightened neurobiological sensitivity underscores the urgent need for context-specific, evidence-based nutritional interventions targeting adolescent populations.

References 

1. Brkić, D., Concetti, C., Rémond Derbez, N., & Hauser, J. (2026). Relationship between nutrition, brain, cognition, learning, and behavior in school age children. Nutrition Reviews. [academic.oup.com]
2. Young, H. A., Gaylor, C. M., Brennan, A., McIntosh, A., & Griffiths, A. R. (2026). Diet and the developing brain. Advances in Nutrition. [advances.n...rition.org]
3. World Health Organisation. (2018). Guideline: implementing effective actions for improving adolescent nutrition. [who.int]