Children spending more than two hours a day watching TV double their risk of developing asthma, according to a study published in Thorax journal. The study tracked the health of over 3,000 UK children from birth to 11.
The study, published in Thorax journal, tracked the health of over 3,000 UK children from birth to 11.
While all of them were free of wheeze as babies and toddlers, by the time they were eleven-and-a-half, 185 (6%) of the children had developed asthma.
And children who watched TV for more than two hours a day were almost twice as likely to have been diagnosed with asthma as those who watched the telly less. However, the odds were still small - about two in 100.
Of the children with asthma, 2% did not watch TV, 20% watched TV daily for less than an hour, 34% watched 1-2 hours a day and 44% watched more than two hours daily.
Given that none of the children had wheeze at the age of three-and-a-half, it is unlikely that the children who went on to develop asthma had been forced to do less exercise from an early age because of asthma symptoms, say the researchers.
They speculate that inactivity is the underlying explanation for their findings, if you assume that children who watch more TV lead less active lives - they did not directly monitor the children's exercise levels during the study.