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 .
Satiety and energy intake after single and repeated exposure to gel-forming dietary fiber: post-ingestive effects
Background : Viscous or gel-forming dietary fibers can increase satiety by a more firm texture and increased eating time . Effects of viscous or gel-forming fibers on satiety by post-ingestive mechanisms such as gastric emptying , hormonal signals , nutrient absorption or fermentation are unclear . Moreover , it is unclear whether the effects persist after repeated exposure . Objective : To investigate satiety and energy intake after single and repeated exposure to gelled fiber by post-ingestive mechanisms . Design : In a two-arm crossover design , 32 subjects ( 24 female subjects , 21±2 y , BMI 21.8±1.9 kg m−2 ) consumed test foods once daily for 15 consecutive days , with 2 weeks of washout . Test foods were isocaloric ( 0.5 MJ , 200 g ) with either 10 g gel-forming pectin or 3 g gelatin and 2 g starch , matched for texture and eating time . Hourly satiety ratings , ad libitum energy intake and body weight were measured on days 1 ( single exposure ) and 15 ( repeated exposure ) . In addition , hourly breath hydrogen , fasting glucose , insulin , leptin and short-chain fatty acids were measured . Results : Subjects rated hunger , desire to eat and prospect i ve intake about 2 % lower ( P<0.015 ) and fullness higher ( + 1.4 % ; P=0.041 ) when they received pectin compared with control . This difference was similar after single and repeated exposure ( P>0.64 ) . After receiving pectin , energy intake was lower ( −5.6 % , P=0.012 ) and breath hydrogen was elevated ( + 12.6 % , P=0.008 ) after single exposure , but not after repeated exposure . Fasting glucose concentrations were higher both after single and repeated exposure to pectin ( + 2.1 % , P=0.019 ) . Body weight and concentrations of insulin , leptin and short-chain fatty acids did not change during the study . Conclusions : Gelled pectin can increase satiety and reduce energy intake by post-ingestive mechanisms . Although the effects were small , the effects on satiety were consistent over time , whereas the effects on energy intake reduction were not
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 .