Screen time linked to worse grades and mental health in children, global study of 2.8 million finds

From the Newshound archive · first published 28 September 2026 · last updated 29 September 2026.

A landmark study published in JAMA Pediatrics has found that heavy screen use is linked to poorer academic and mental health outcomes in children — with effects researchers say are comparable to, or greater than, being born into poverty, premature birth, or poor parenting. Researchers at the University of Calgary led an umbrella review drawing on data covering over 2.8 million children across 64 countries, with today's coverage focusing on the study's specific findings on learning and psychological harm. Higher levels of screen exposure were linked to reduced grades, weaker language development, and elevated rates of anxiety, depression, aggression and ADHD symptoms. The review ranks among the largest of its kind ever undertaken on this topic.

Gaming, social media and streaming were each associated with worse academic performance and weaker language skills in children.

Children with high screen exposure showed greater emotional difficulties, peer problems and internalising behaviours such as anxiety and depression.

Birmingham headteacher Peter Lee said children are now arriving at school unable to toilet-train themselves and trying to swipe printed reading books like touchscreens.