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 .
Sitting Behavior and Obesity
Background Prospect i ve studies report associations between indicators of time spent sitting and  obesity risk .  Most studies use a single indicator of sedentary behavior and are unable to clearly identify whether sedentary behavior is a cause or a consequence of obesity . Purpose To investigate cross-sectional and prospect i ve associations between multiple sitting time indicators and  obesity  and examine the possibility of reverse causality . Methods Using data from the Whitehall II cohort , multiple logistic models were fitted to examine associations between prevalent obesity ( BMI ≥30 ) at Phase 5 ( 1997–1999 ) , and incident obesity between Phases 5 and 7 ( 2003–2004 ) across four levels of five sitting exposures ( work sitting , TV viewing , non-TV leisure-time sitting , leisure-time sitting , and total sitting ) . Using obesity data from three prior phases ( 1985–1988 , 1991–1993 ; and recalled weight at age 25 years ) , linear regression models were fitted to examine the association between prior obesity and sitting time at Phase 5 . Analyses were conducted in 2012 . Results None of the sitting exposures were associated with obesity either cross-sectionally or prospect ively . Obesity at one previous measurement phase was associated with a 2.43-hour/week ( 95 % CI=0.07 , 4.78 ) increase in TV viewing ; obesity at three previous phases was associated with a 7.42-hour/week ( 95 % CI=2.7 , 12.46 ) increase in TV-viewing hours/week at Phase 5 . Conclusions Sitting time was not associated with obesity cross-sectionally or prospect ively . Prior obesity was prospect ively associated with time spent watching TV per week but not other types of sitting
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 .