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Having to pause and stop typing or put down the controller/pen in order to consume food may also reduce the likelihood of distraction and impairment of memory formation leading to overeating. A recent study found a stronger association between TV time and consumption of sugary drinks than for total screen time,34 supporting the hypothesis that higher food consumption occurs during TV viewing than other forms of leisure time sitting. In addition to increased food consumption during TV viewing, TV viewing may also indirectly increase children's energy consumption through exposure to food and drink adverts shown between children's TV programmes,35 with between 4% and 18% of childhood obesity in Britain thought to be attributable to TV food advertising.36 Other forms of leisure time sitting are not subject to such exposure to food advertising. The strengths of this study include the large, nationally representative sample, and the use of multiple indicators of objectively assessed and questionnaire-based sedentary time. The limitations include the cross-sectional design, which precludes causal inferences about the association between TV time and obesity in children. In particular, we cannot rule out the possibility of bidirectional causality, that is, obese children are more likely to watch more TV. However, other studies have found TV time to be prospectively associated with adiposity in children.37 Another limitation is the inability of SB measured by an accelerometer to differentiate between sitting and standing, which have different health implications. It has been argued that standing should not be considered a SB,38 although the use of accelerometers to identify time spent sedentary is widespread. However, time spent standing still may be minimal, especially in young children. The selleck kinase inhibitor sample had a broad age range, from 5 to 15?years, with sedentary time reported by parental proxy at younger ages. If the association between SB and obesity changes over childhood, or if parental proxy and self-reported estimates of sedentary time are markedly different, failing to stratify by age would produce invalid results; however, we found no evidence of interactions between broad age group and SB in predicting obesity. Conclusion TV time, but not other measures of sedentary time, was associated with BMI-measured adiposity and obesity in children, after adjusting for MVPA. While a causal relationship cannot be established from this study, interventions to reduce obesity in childhood and adolescence may benefit from a focus on reducing TV time. Acknowledgments This work was funded by the National Institute for Health Research through a Career Development Fellowship (ES). NC was also funded by the National Institute for Health Research through the same source. Footnotes Contributors: NC and ES conceived the idea.