Nutrition and the Adolescent Brain

A growing and converging body of evidence positions diet quality as a principal determinant of cognitive development, behavioural regulation, and academic achievement across childhood and adolescence. Whole-food dietary patterns,  characterised by high intakes of fruits, vegetables, legumes, whole grains, and healthy unsaturated fats, are consistently associated with more favourable brain structure and function, superior cognitive performance, and improved behavioural outcomes, while diets dominated by ultra-processed, energy-dense, and micronutrient-poor foods are linked to impaired attention, greater internalising and externalising symptoms, and poorer academic trajectories. ^{1;5, 8}

The Mediterranean dietary pattern has received particular empirical attention in adolescent populations, with evidence suggesting that higher adherence is associated not only with reduced anxiety and depressive symptomatology but also with more adaptive emotional and behavioural regulation, effects proposed to operate through reductions in systemic neuroinflammation, enhanced antioxidant status, and favourable modulation of the gut-brain axis.²

The adolescent brain's continued and protracted neuroplasticity,  encompassing ongoing myelination, synaptic pruning, and the functional maturation of prefrontal and fronto-limbic networks, means that nutritional exposures during this period retain a meaningful capacity to shape cognitive and behavioural trajectories, though the magnitude and directionality of effects are moderated by contextual factors including baseline nutritional status, socioeconomic environment, pubertal stage, and the timing and duration of dietary exposures.⁷

Critically, the existing literature increasingly supports a paradigmatic shift away from single-nutrient reductionism toward a whole-diet, dietary-pattern framework. This approach better reflects the synergistic and interactive nature of nutrients in supporting neurodevelopmental processes, including long-chain polyunsaturated fatty acid (LC-PUFA) availability for myelination, iron sufficiency for neurotransmitter synthesis and oxygen transport, and B-vitamin adequacy for one-carbon metabolism and epigenetic regulation, and is more amenable to scalable, food-based public health interventions.^{1, 8,5}

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. Dutta, S. S. (2026). Eating a Mediterranean diet may lower anxiety symptoms in teens. Nutrients. [news-medical.net]
3. Larsen, B. (2025). Importance of iron for adolescent brain development and cognition. Journal of the American Academy of Child and Adolescent Psychiatry. [jaacap.org]
4. López Sebastiani, V., Quiroz Cornejo, K. V., Arellano Salazar, M. P., Monje Bolivar, F., & Samillan, V. J. (2026). Micronutrient balance and brain function. Frontiers in Molecular Biosciences. [pmc.ncbi.nlm.nih.gov]
5. MacBrain Research Team. (2024). Nutrition’s impact on adolescent brain function and academic performance. [macbrain.org]
6. World Health Organisation. (2018). Guideline: implementing effective actions for improving adolescent nutrition. [who.int]
7. 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]
8. Nestlé Nutrition Institute. (2026). Nutritional influences on brain, behaviour, and growth trajectories in school age children. [The Nest 5...Children_0 | PDF]