Increased Daily Steps May Improve Mental Health in Teens, Study Finds

Participants wore Fitbit devices to track their daily steps for three weeks around the ages of 11 to 12. A year later, researchers assessed their mental health using the Child Behaviour Checklist, which evaluates symptoms such as anxiety and mood disorders. Findings indicated that a higher daily step count was associated with fewer mental health issues. Specifically, teenagers averaging under 5,000 steps daily exhibited the highest symptoms, while those achieving approximately 12,000 steps reported the lowest.

Moreover, those with the greatest step counts showed slight increases in brain tissue thickness in areas related to movement and emotion regulation, which may help explain the link to improved mental health. However, there was no correlation found between step counts and academic performance.

Dr. Divyangana Rakesh, Senior Lecturer at King's College London and senior author of the study, noted that the evidence highlights a clear connection between daily step counts and adolescent mental health, stating, "What's striking is that we don't see this benefit levelling off in the observed range."

Lead author Qingyang Li pointed out that this research helps elucidate the brain mechanisms involved in the relationship between physical activity and mental health.

The study is part of the Adolescent Brain Cognitive Development Study, which is the most extensive long-term investigation of brain development and child health in the US, utilizing objective data from wearable devices for greater accuracy. Dr. Amanda Paluch from the University of Massachusetts Amherst emphasized that benefits are seen even with modest increases in daily steps, underlining the importance of accessible physical activity for teens.

It’s important to note that this is an observational study, meaning it cannot definitively establish causation between increased walking and improved mental health. While the link persisted despite accounting for prior mental health problems, the authors acknowledge that those with fewer issues might naturally engage in more physical activity. Additionally, the group of adolescents achieving exceptionally high step counts was small, leaving questions about whether these trends hold beyond the observed range.