Effects of apple juice-based beverages enriched with dietary fibres and xanthan gum on the glycemic response and appetite sensations in healthy men

• Two fibre-enriched juices owning a similar viscosity were compared to a non-enriched juice.
• Juices were enriched with guar/xanthan gums and konjac-mannan/xanthan gum mixtures.
• These enriched juices had no impact on postprandial glucose and insulin responses.
• Juice enriched with konjac-mannan/xanthan gum decreased appetite sensations.
• Viscosity of juices is probably not the only factor influencing glucose and appetite.

In order to verify whether other fibre characteristics, beyond viscosity can have an impact on glycaemia and appetite sensations, the aim of this study was to compare the effects of two palatable juices owning a similar viscosity value but enriched with guar gum/xanthan gum or konjac-mannan/xanthan gum mixture to a control non-enriched juice on the variation of glucose, insulin, C-peptide and appetite sensations in 20 healthy men. In a randomized crossover design, each volunteer consumed two beverages enriched with fibres (guar gum/xanthan gum and konjac-mannan/xanthan gum mixtures) as well as a control beverage without fibre. One week wash-out separated the testing of each beverage. Blood samples were collected to measure glucose, insulin and C-peptide before and after the consumption of each beverage. Appetite sensations were assessed using visual analogue scales. Glucose, insulin and C-peptide concentrations were similar before the consumption of the three juices (p>0.05). Juices enriched with fibres failed to significantly reduce postprandial glucose, insulin and C-peptide responses compared to the control beverage. However, consumption of the beverage enriched with konjac-mannan/xanthan gum mixture decreased significantly the appetite score, compared to the two other beverages and increased fullness sensation compared to the guar gum/xanthan gum enriched beverage (p<0.05). These results suggest that viscosity of fibre-enriched juices cannot be the unique factor influencing appetite responses. Further studies will be required to determine polysaccharide viscosity and concentration needed to obtain significant effects on glycemic and insulinemic responses for beverages enriched with guar gum/xanthan gum and konjac-mannan/xanthan gum mixtures.

Despite the absence of significant effects on glucose response, the consumption of the juice enriched with konjac-mannan/xanthan gum (KX) decreased appetite sensations compared to guar gum/xanthan gum enriched beverage (GX) and non-enriched control beverage.↑Consumption of the juice.Figure optionsDownload as PowerPoint slide