Phoenix 24
The strongest warning concerns what digital exposure replaces: sleep, movement and direct social contact.
GLOBAL
Daily screen use has become inseparable from education, employment and social life, but a growing body of research associates prolonged exposure with depression, anxiety, disrupted sleep, eye strain and musculoskeletal pain. An international meta-analysis covering more than 71,000 university students across 27 countries found that risks became more pronounced as daily exposure increased, particularly beyond approximately two and a half hours.
The findings do not prove that screens independently cause every reported condition. Much of the available evidence comes from observational or cross-sectional studies, which cannot fully separate screen use from pre-existing anxiety, depression, sedentary behaviour or socioeconomic factors. People experiencing emotional difficulties may also spend more time online, creating a relationship that can operate in both directions.
The physical concerns are more direct. Extended periods in fixed positions can contribute to neck, back and shoulder pain, while sustained close viewing may produce dry eyes, headaches and temporary focusing problems. Other studies have linked more than six hours of daily recreational exposure with higher body mass index and less favourable cardiovascular indicators. These associations may partly reflect reduced exercise, irregular meals and insufficient sleep rather than the screen itself.
Children and adolescents may be particularly vulnerable because digital habits interact with development, school performance and emotional regulation. Research has associated heavy use with poorer sleep, attention difficulties and symptoms of anxiety or depression. However, the content, timing and purpose of exposure matter. Educational activity, creative work and communication with supportive communities cannot be treated as equivalent to compulsive scrolling, nighttime gaming or repeated exposure to harmful content.
The evidence therefore supports healthier digital routines rather than indiscriminate prohibition. Regular movement breaks, adequate viewing distance, reduced use before bedtime and protected time for exercise and face-to-face interaction can limit risk. Families, schools and employers also share responsibility with technology companies whose platforms are designed to prolong attention. The central public-health question is not simply how many hours people spend looking at screens, but what those hours displace and how digital environments shape behaviour.
La verdad es estructura, no ruido. / Truth is structure, not noise.