Digital media use tied to worse health in young people

Clinical takeaway: Watch for problematic social media, internet, and phone use in adolescents, the pattern associated with negative emotions, loneliness, and self-harm. Difficulties may include disrupted sleep, schoolwork, or relationships as well as loss of control, preoccupation, and withdrawal. 

Guidance on young people's screen use has centered on time limits, even as children now typically start using digital devices in infancy. For a clinician weighing a teenager's poor sleep or low mood against screen use, a time limit can't settle whether the hours are the cause. 

Most of the research behind those limits is cross-sectional, so heavy use can't be separated from the problems that may drive it. Screen time itself is defined inconsistently and says little about what a young person is doing on the device. A new synthesis of the existing review literature, paired with modeling of the potential burden, confirms a consistent direction of findings across ages without settling cause. 

Adverse associations made up 80% of the 181 adolescent findings, versus 8% that were beneficial. Adolescent findings most often covered common mental health problems, sleep, wellbeing, substance use, and self-harm or suicide. Among the 52 childhood findings, 71% were adverse with 10% beneficial. Childhood findings centered on cognitive and academic outcomes, sleep, common mental health problems, language development, and conduct. Educational content was associated with more than twice the odds of better language development in children. In adolescents, moderate, socially oriented use was linked to better wellbeing and perceived social support. 

Among adolescents, problematic use was linked to negative emotions or conduct problems at about three times the odds. Poorer quality of life, loneliness, common mental health problems, and self-harm or suicidal ideation or behavior each showed more than twice the odds with problematic use. Adolescents with higher social media use were almost twice as likely to have common mental health problems. Among children, smartphone or tablet use was associated with poorer sleep duration or quality at nearly twice the odds. Higher screen time tracked with common mental health problems at about one and a half times the odds. 

Modeling estimated that about 20% of depression cases and 15% of obesity cases in people younger than 25 are associated with exceeding two hours of screen time a day. 

The authors drew on an umbrella review of 121 systematic reviews covering 2,790 primary studies and nine million people aged 0 to 24, analyzing its childhood and adolescent findings separately. They applied its pooled estimates to screen time data from 49 countries, describing the modeled figures as illustrative, not evidence of population-level harm. 

The most valuable evidence on how digital media affects young people is held by technology companies. Regulatory initiatives under the European Union's digital governance regime aim to compel major platforms to give vetted researchers access to that data. The authors also want longitudinal and experimental studies of how platform design shapes health over time. They say public health guidance should move beyond screen-time thresholds toward approaches that reflect developmental stage, content, and context. 

"Ultimately, the case for action does not rest on definitive causal estimates, but on the convergence of widespread exposure, plausible and unevenly distributed risks, and the structural conditions that shape young people's digital lives," the authors conclude. 

Source: Holly L, et al. (2026 Oct 4) Lancet. The public health challenges of children's and adolescents' digital media use: applying the digital determinants of health as an interpretive framework