Conclusions Meta- analysis of data from prospect i ve cohort studies showed small , inconsistent and non-significant associations between sedentary behavior and body weight
Background The cumulative effect of too much sedentary behavior may contribute to  weight gain and obesity .
Objective The aim of this study was to conduct a systematic review and meta- analysis of prospect i ve cohorts and r and omized controlled studies to determine the association between sedentary  behavior  and body weight and obesity in adults .
Sedentary Behaviours in Mid-Adulthood and Subsequent Body Mass Index
Objectives It is unclear whether sedentary behaviour , and the domain in which it occurs , is related to  body mass index ( BMI ) change . We aim to eluci date whether sedentary behaviour is prospect ively related to BMI change using markers from three domains ( leisure , work and commuting ) . Methods Among employed 1958 British birth cohort members ( n = 6,562 ) , we analysed whether TV-viewing , work sitting ( six categories : 0 h/d to > 4 h/d ) and motorised commuting ( at 45 y ) were related to BMI ( at 45 y and 50 y ) and BMI change 45–50 y , after adjusting for lifestyle and socioeconomic factors . Results Per category higher TV-viewing , 45 y and 50 y BMI were higher by 0.69 kg/m2 ( 95 % CI : 0.59,0.80 ) and 0.75 kg/m2 ( 0.64,0.86 ) respectively . A category higher TV-viewing was associated with 0.11 kg/m2 ( 0.06,0.17 ) increased BMI 45–50 y , attenuating to 0.06 kg/m2 ( 0.01,0.12 ) after adjustment . There was no trend for work sitting  with 45 y or 50 y BMI , nor , after adjustment , for BMI change . However , those sitting 2–3 h/d had greater BMI gain by 0.33 kg/m2 ( 0.10,0.56 ) compared to those sitting 0–1 h/d . Associations between TV-viewing and BMI change were independent of work sitting . Motorised commuting was associated with 45 y , but not 50 y BMI or change . Conclusions TV-viewing is associated with BMI gain in mid-adulthood ; evidence is weaker for other sedentary behaviours
Conclusions Meta- analysis of data from prospect i ve cohort studies showed small , inconsistent and non-significant associations between sedentary behavior and body weight
Background The cumulative effect of too much sedentary behavior may contribute to  weight gain and obesity .
Objective The aim of this study was to conduct a systematic review and meta- analysis of prospect i ve cohorts and r and omized controlled studies to determine the association between sedentary  behavior  and body weight and obesity in adults .