How Childhood Habits Shape Adolescent Mental Health

Introduction

A recent study from Finland reveals a strong link between daily childhood habits and mental health in adolescence. These habits include physical activity, screen time, sleep, and diet.

Researchers followed 187 children aged 6–9 over eight years. They studied how these lifestyle behaviors affected mental well-being as the children grew up.

According to the World Health Organization (WHO), 8% of children and 15% of adolescents suffer from mental disorders. About 25–30% face mental health issues that begin during adolescence.

Why Childhood and Adolescence Matter

Human development happens in key stages: infancy (0–1 year), toddlerhood (1–5 years), early childhood (3–5 years), adolescence (12–18 years), and adulthood.

Among these, childhood and adolescence are the most critical. They shape a person’s physical, cognitive, emotions, and social skills. The brain undergoes significant changes during this time, shaping how a person thinks, feels, and interacts with the world.

The environment plays a major role. Children thrive in supportive homes, schools, and communities. However, challenges like family conflict, violence, poverty, or unaddressed mental health problems can have lasting effects.

These early influences often shape future success, relationships, and emotional health. Therefore, understanding this phase is key to building healthier individuals and societies.

Who Took Part in the Study?

The study involved 187 children from Finland. Researchers began tracking them at ages 6 to 9 and followed them for eight years. This was a prospective cohort study, where participants are observed over time to see how their behaviours impact later outcomes.

How Was the Study Conducted?

The researchers looked at how physical activity, screen time, sleep, and diet from childhood to adolescence affected mental health.

• Physical activity and screen time were recorded through a questionnaire.
• Wearable devices tracked movement, heart rate, and sedentary time.
• Diet was assessed using a four-day food diary. Its quality was rated using the Baltic Sea Diet Score.

Key Findings

The study examined mental health status by assessing various factors, including self-reported behaviours, device-associated metrics, and dietary habits, from childhood to adolescence. It then compared the mental health of teens based on these lifestyle habits.

Self-Reported Behaviors

• Children who reported more physical activity as they grew up had lower stress and fewer mental health issues.
• Those who reported more screen time, especially on phones and computers, faced more mental health problems.

Device-Measured Behaviors

•  Factors such as physical activity, sedentary behavior, and sleep duration from childhood to adolescence showed no significant correlation with mental health issues in adolescents.

Diet Quality

• There was no change in mental health status based on diet quality throughout childhood and adolescence.
  

What Does The Study Highlight?

This study highlights how some lifestyle habits affect teens’ mental health more than others.

•  Higher stress levels and signs of depression were observed in adoloscents who used mobile devices and spent excessive time on screens. 
  
• Physical activity was evaluated through self-reports and device tracking, which showed differing effects on mental health. Increased self-reported physical activity was linked to a decrease in mental health issues, whereas evidence from device assessments was mixed.
• Screen time had the strongest impact, more than either physical activity or diet.

Conclusion

Cutting back on screen time is vital for protecting children’s mental health. Parents and healthcare providers must guide kids in using mobile devices wisely. Teaching children to limit screen use is just as important as encouraging them to move and play. To boost brain activity, children can play puzzle games like Sudoku. Spending time with grandparents and relatives also adds emotional value and social support. Finally, physical activity matters. Kids should stay active by joining sports, outdoor games, or community events. These habits help them grow into healthier, more balanced adults.

Source

Haapala EA, Leppänen MH, Kosola S, Appelqvist-Schmidlechner K, Kraav S-L, Jussila JJ, et al. Childhood Lifestyle Behaviors and Mental Health Symptoms in Adolescence. JAMA Netw Open [Internet]. 2025 [cited 2025 May 23]; 8(2):e2460012. Available from: https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2830233.

Written By: Dr. Merlin Levy T S

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