Children and teenagers glued to screens for hours on end are at a heightened risk of developing heart and metabolic problems later in life, particularly when sleep is sacrificed, according to a groundbreaking new study published in the Journal of the American Heart Association.
Researchers from the University of Copenhagen’s Copenhagen Prospective Studies on Asthma in Childhood (COPSAC) found a clear link between prolonged screen time and increased cardiometabolic risk, even in young children. Analyzing data from over 1,000 participants across two long-term Danish cohorts, including 10-year-olds and 18-year-olds, the study paints a concerning picture of how modern technology is impacting the health of the next generation.
“Each extra hour of recreational screen time was associated with a measurable increase in cardiometabolic risk,” explained lead author David Horner, a researcher at COPSAC. “It might seem small per hour, but over time, and across a population, it adds up to a significant shift in early health risks that can follow into adulthood.” The study measured risk using a composite cardiometabolic score, incorporating indicators like waist circumference, blood pressure, cholesterol levels, triglycerides and blood sugar.
The findings reveal that the impact of screen time is not just a gradual increase; it’s exacerbated by insufficient sleep. The combination of high screen time and short sleep duration significantly amplified the risk scores. “Shorter sleep partly mediates how screen time contributes to metabolic changes,” Horner added.
Researchers discovered a unique “screen-time fingerprint” using machine learning, which identified a distinct blood metabolite pattern suggesting biological changes linked to prolonged screen use. They also found that the associations were potentially stronger in boys, though formal interaction tests showed statistically insignificant differences.
Experts are urging parents to take note. “Limiting discretionary screen time in childhood and adolescence may protect long-term heart and metabolic health,” advised Dr. Horner.
The study has prompted recommendations to incorporate discussions of screen habits into routine pediatric care, alongside guidance on diet and exercise. Dr. Amanda Perak, chairperson of the American Heart Association Young Hearts Cardiovascular Disease Prevention Committee, recommends a gradual approach to change, suggesting families focus on shifting screen time earlier in the day and prioritizing earlier bedtimes. She also underscored the importance of parents modeling healthy screen usage: “Put devices away during meals, explain why, and encourage screen-free family time.”
The study, the first of its kind to leverage long-term mother-child cohort data and advanced blood metabolomics, indicates that screen time should be considered a standalone behavioral risk factor for early metabolic and cardiovascular changes. With screen usage among adolescents often reaching five to six hours daily, the study highlights the importance of understanding and addressing its potential long-term consequences. Interventions to reduce risk may need to be tailored to the specific needs of children and adolescents, considering the varying influences of lifestyle factors like sleep.
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