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 .
Prospective study of the association of changes in dietary intake, physical activity, alcohol consumption, and smoking with 9-y gain in waist circumference among 16 587 US men.
BACKGROUND Although it is known that abdominal obesity increases the risk of chronic diseases , prospect i ve data examining the relation between lifestyle factors and the accumulation of abdominal adipose tissue are sparse . OBJECTIVE The objective of the study was to determine the associations of changes in diet , physical activity , alcohol consumption , and smoking  with 9-y waist gain among US men . DESIGN A prospect i ve cohort comprised 16 587 US men aged 40 - 75 y at baseline in 1986 .  Data on  lifestyle factors  were provided periodically with the use of self-reported question naires , and participants measured and reported their waist circumference in 1987 and 1996 . RESULTS In multivariate analyses , a 2 % increment in energy intake from trans fats that were isocalorically substituted for either polyunsaturated fats or carbohydrates was significantly associated with a 0.77-cm waist gain over 9 y ( P < 0.001 for each comparison ) . An increase of 12 g total fiber/d was associated with a 0.63-cm decrease in waist circumference ( P < 0.001 ) , whereas smoking cessation and a 20-h/wk increase in television watching were associated with a 1.98-cm and 0.59-cm waist gain , respectively ( P < 0.001 ) . Increases of 25 metabolic equivalent tasks ( METs ) * h/wk in vigorous physical activity and of > /= 0.5 h/wk in weight training were associated with 0.38-cm and 0.91-cm decreases in waist circumference , respectively ( P < 0.001 for each comparison ) . These associations remained significant after further adjustment for concurrent change in body mass index . Changes in total fat and alcohol consumption and in walking volume were not significantly related to waist gain . CONCLUSIONS Waist gain may be modulated by changes in trans fat and fiber consumption , smoking cessation , and physical activity
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 .