Among North American school-age children, there is a strong positive correlation between obesity and the amount of television watched. Ttherefore, with the arrival of interactive television, obesity among North American school-age children will increase. The argument requires the assumption that ['North American school-age children will increase their television viewing with the arrival of interactive television', 'a sedentary lifestyle is among the most important causes of childhood obesity', 'genetics makes no significant contribution to obesity', 'obesity among North American school-age children increased as cable television became widely available']