A recent study involving over 5,500 young adolescents across the United States has shown that those who walked more daily between the ages of 11 and 12 reported fewer mental health problems a year later. Conducted by researchers from King’s College London’s Institute of Psychiatry, Psychology & Neuroscience in collaboration with the University of Massachusetts Amherst, the study is published in JAMA Network Open. It provides significant evidence that everyday physical activity positively influences adolescent brain development and mental health.
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The research is part of the Adolescent Brain Cognitive Development Study, the largest long-term investigation of brain development and child health in the country, conducted across 21 research sites. The study tracked 5,515 adolescents who wore Fitbit devices for three weeks during their early teenage years. This approach allowed for an objective measure of daily activity, contrasting with the less reliable self-reporting methods used in many previous studies.
After tracking their step counts, researchers assessed the participants' mental health a year later using the Child Behaviour Checklist, completed by both the adolescents and their parents. The assessment focused on symptoms such as anxiety and behavioral challenges. Analysis revealed a clear trend: higher daily step counts corresponded with lower reported mental health issues. Specifically, teens averaging fewer than 5,000 steps daily exhibited the highest symptom levels, while those averaging 8,000 steps had fewer and those exceeding 12,000 steps experienced the least.
The study also explored biological underpinnings, utilizing neuroimaging data from the ABCD cohort. Results indicated that adolescents with higher step counts had slightly thicker brain tissue in regions responsible for movement and emotional regulation, supporting the association between active lifestyles and mental health improvements during critical developmental stages.
Qingyang Li, the study’s lead author, noted that understanding specific brain areas linked to daily steps and mental health provides direction for future research. Dr. Divyangana Rakesh, a senior author, emphasized the importance of these findings as concrete evidence that even small amounts of daily physical activity can crucially influence adolescent mental well-being.
Dr. Amanda Paluch from the University of Massachusetts Amherst highlighted that adolescents do not need to engage in elite athletic activities to reap the benefits. Incremental increases in daily steps, even by 1,000 to 2,000 from any starting point, are associated with better brain structures and mental health outcomes.
Importantly, the study found no correlation between step counts and academic performance, suggesting that the benefits of walking primarily relate to brain structure and mental health rather than educational achievement within the examined year.
While the study establishes an association rather than causation, the consistent findings—controlling for earlier mental health issues—strengthen the argument that increased physical activity may serve a protective role. The overall combination of objective activity tracking, a large sample size, and neuroimaging evidence presents compelling support for the belief that increased daily walking can positively impact the developing adolescent mind.