Children who spend more than two hours a day watching TV have double the risk of developing asthma, a UK study has found. 3,000 children were tracked from birth to age 11. Their parents were questioned annually about incidence of wheeze and diagnosed asthma among their children. They were also asked to assess children’s television viewing habits from age three-and-a-half onwards. None of the children had symptoms of wheeze at 3.5 years of age. At age 11.5 185 (6%) of the children had developed asthma and those 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 less. (Association of duration of television viewing in early childhood with the subsequent development of asthma. Thorax. 2009 Apr;64(4):321-5. Epub 2009 Mar 13).