RESULTS The present study indicated that the efficacy of various fiber supplements on losing weight is variable .
Several mechanisms related to physicochemical properties of fibers such as solubility , fermentability and viscosity rates can be involved in their anti-obesity effects .
Dextrin , Mannan ( gum Arabic ) and pectin-rich fiber ( lupin kernel ) with no dietary interventions indicated a reduction in body weight and energy intake , while from clinical point of view , their effects were not considerable .
Overall , findings indicated that the efficacy of fiber supplements on obesity management is dependent on their contents and physicochemical properties .
It seems that fiber supplements with no weight-loss interventions did not have considerable antiobesity effects .
BACKGROUND Previous trials have reported beneficial effects of isolated and complex fiber supplements in obesity treatment .
However , recommending fiber supplements in obese subjects remains controversial .
To the best of our knowledge , no systematic review has up date d the data on the effects of fiber supplements on obesity since 2010 and the need exists for a systematic review on this topic .
Accordingly , a systematic review was undertaken to summarize the efficacy of different types of fiber supplements as a complementary treatment for weight management .
White Rice Consumption, Body Mass Index, and Waist Circumference among Iranian Female Adolescents
Objective : Refined grains consumption is positively associated with obesity .  White rice is the most usual refined grain in Iran . However , few studies have assessed the association between rice intake and anthropometric measures among adolescents . Therefore , we aim ed to compare anthropometric measures as well as the diet quality indices across the tertiles of  white rice consumption among Iranian adolescents . Methods : This cross-sectional study was conducted on 415 female adolescents who were chosen by using a systematic cluster r and om sampling .  Dietary intake assessment was done using a vali date d semiquantitative food frequency question naire . Anthropometric measures were done according to the st and ard protocol s. Diet quality indices ( including dietary energy density [ DED ] , nutrient adequacy ratio [ NAR ] , and mean adequacy ratio [ MAR ] ) were calculated using st and ard definitions . Results : The prevalence of overweight across the tertiles of rice consumption was 11.6 , 17.8 , and 24.6 % , respectively ( p = 0.03 ) . Corresponding values for obesity were 2.1 , 5.7 , and 8.6 % , respectively ( p = 0.04 ) . A significant positive association was observed for the prevalence of central obesity across the tertile of rice intake ( 13.1 , 21.4 , and 28.1 % ; p = 0.02 ) . Dietary fiber and energy intake and diet quality indices were significantly different among different tertiles of white rice intake . Those in the highest tertiles of white rice intake had the lowest scores for MAR and NAR and highest scores for DED . Conclusion : There was significant association between rice consumption and obesity as well as diet quality indices among Iranian adolescents
RESULTS The present study indicated that the efficacy of various fiber supplements on losing weight is variable .
Several mechanisms related to physicochemical properties of fibers such as solubility , fermentability and viscosity rates can be involved in their anti-obesity effects .
Dextrin , Mannan ( gum Arabic ) and pectin-rich fiber ( lupin kernel ) with no dietary interventions indicated a reduction in body weight and energy intake , while from clinical point of view , their effects were not considerable .
Overall , findings indicated that the efficacy of fiber supplements on obesity management is dependent on their contents and physicochemical properties .
It seems that fiber supplements with no weight-loss interventions did not have considerable antiobesity effects .
BACKGROUND Previous trials have reported beneficial effects of isolated and complex fiber supplements in obesity treatment .
However , recommending fiber supplements in obese subjects remains controversial .
To the best of our knowledge , no systematic review has up date d the data on the effects of fiber supplements on obesity since 2010 and the need exists for a systematic review on this topic .
Accordingly , a systematic review was undertaken to summarize the efficacy of different types of fiber supplements as a complementary treatment for weight management .