Multi-screen health fears for children
Parents have been warned of the potential dangers of children watching TV while also using other interactive devices.
University researchers said children were often "multi-screen viewing" - watching TV while at the same time using smartphones, laptops or hand-held gaming devices.
A sedentary lifestyle - linked to spending lots of time watching TV and playing computer games - is thought to increase the risk of obesity and mental health problems, researchers at Bristol and Loughborough universities said.
Dr Russ Jago, from Bristol University's Centre for Exercise, Nutrition and Health Sciences, said: "The children in this study often had access to at least five different devices at any one time, and many of these devices were portable."