A new study suggests that increased daily physical activity, measured by step count, may be linked to improved mental health outcomes in adolescents. Researchers found that teenagers who took more steps each day exhibited fewer symptoms of anxiety, low mood, and behavioral problems one year later.
The study involved over 5,500 young participants from the United States, with an average age of 12. They were monitored using Fitbit devices worn for three weeks to track their daily steps. Researchers then assessed their mental health a year later using the child behaviour checklist, a tool that gathers information from both the adolescents and their parents.
Results demonstrated a consistent association between higher step counts and reduced mental health difficulties. Adolescents averaging fewer than 5,000 steps per day experienced the most symptoms, while those who reached around 8,000 steps had notably fewer problems. The lowest levels of mental health symptoms were observed among those taking 12,000 steps or more daily. Importantly, the benefits appeared to increase steadily with every additional 1,000 to 2,000 steps, without evidence of a plateau even among the most active participants.
Dr Divyangana Rakesh of King’s College London, who co-led the research, noted that this study offers substantial evidence linking routine physical activity to brain development and mental health in teenagers. She emphasized that benefits were observed across the full range of activity levels, not just at high step counts.
Dr Amanda Paluch, associate professor of kinesiology at the University of Massachusetts Amherst, highlighted that improvements are achievable without intense athletic training. She pointed out that modest increases in daily steps through activities like walking to school, shopping, or active play could yield meaningful mental health benefits regardless of a young person’s baseline activity.
The study also found a modest association between higher step counts and increased thickness in certain brain regions related to movement and emotional regulation. These neurological differences were connected to better mental health outcomes, though researchers caution that the findings do not establish a direct causal relationship between step count and mental health.
No significant link was observed between step count and academic performance.
The researchers underscored the potential value of promoting everyday physical activities as accessible and low-cost ways to support adolescent mental health. Their findings arrive ahead of a forthcoming government-commissioned review into mental health, ADHD, and autism, which advocates for more needs-based and timely support beyond diagnostic criteria and specialist clinical services.