The World Health Organisation is warning young people's health is being harmed by a dramatic rise in social media and computer games.
Data shows children as young as 11 are spending increasing amounts of time on PCs, smartphones and tablets.
Over a 12-year period, use increased for both sexes, but it more than tripled for girls aged 15 and over.
Tam Fry from Britian's National Obesity Forum thinks parents have a role to play and says children should be encouraged to get out and exercise instead: ”Children in particular should have about an hour of exercise a day and that is not being followed by parents”.