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Vol. 78, No. 1, 2008
Issue release date: November 2008
Section title: Original Paper
Digestion 2008;78:30–33
(DOI:10.1159/000155214)

Effect of Yacon (Smallanthus sonchifolius) on Colonic Transit Time in Healthy Volunteers

Geyer M. · Manrique I. · Degen L. · Beglinger C.
aDepartment of Gastroenterology, University Hospital Basel, Basel, Switzerland; bInternational Potato Center, Lima, Peru

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Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: 11/26/2007
Accepted: 7/23/2008
Published online: 9/10/2008

Number of Print Pages: 4
Number of Figures: 2
Number of Tables: 2

ISSN: 0012-2823 (Print)
eISSN: 1421-9867 (Online)

For additional information: http://www.karger.com/DIG

Abstract

Background: Yacon is a root crop which contains high amounts of fructooligosaccharides (FOS). The aim of this study was to investigate the effects of yacon syrup on colon transit time in healthy volunteers. Methods: In a placebo-controlled, double-blind study yacon was administered to 16 healthy individuals (8 males, 8 females) in a dose of 20 g daily (equal to 6.4 g FOS) in a 2-week crossover design. Each period was interrupted by a 2-week wash-out phase. Transit time was assessed by a radio-opaque marker technique. Results: Transit time (mean ± SEM) through the gastrointestinal tract was significantly decreased from 59.7 ± 4.3 to 38.4 ± 4.2 h (p < 0.001). Yacon was well tolerated with an excellent side effect profile. Bloating is not an uncommon side effect observed with FOS, but bloating-related disturbances were not significantly more often reported with yacon compared to placebo. Stool frequency increased from 1.1 ± 0.1 to 1.3 ± 0.2 times per day and the consistency showed a tendency for softer stools as assessed by a numerical depicted stool protocol. Neither parameter did, however, reach statistical significance. Conclusion: Yacon markedly accelerates colonic transit in healthy individuals. Further studies are needed in constipated patients to confirm these preliminary data. Due to the low caloric content of yacon, the root could be a useful treatment in constipated diabetics or obese patients.


Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: 11/26/2007
Accepted: 7/23/2008
Published online: 9/10/2008

Number of Print Pages: 4
Number of Figures: 2
Number of Tables: 2

ISSN: 0012-2823 (Print)
eISSN: 1421-9867 (Online)

For additional information: http://www.karger.com/DIG


Copyright / Drug Dosage

Copyright: All rights reserved. No part of this publication may be translated into other languages, reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, microcopying, or by any information storage and retrieval system, without permission in writing from the publisher or, in the case of photocopying, direct payment of a specified fee to the Copyright Clearance Center.
Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in goverment regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug.
Disclaimer: The statements, opinions and data contained in this publication are solely those of the individual authors and contributors and not of the publishers and the editor(s). The appearance of advertisements or/and product references in the publication is not a warranty, endorsement, or approval of the products or services advertised or of their effectiveness, quality or safety. The publisher and the editor(s) disclaim responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements.

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