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Differing effects of pectin, cellulose and lignin on stool pH, transit time and weight

Published online by Cambridge University Press:  09 March 2007

Lybus Hillman
Affiliation:
Department of Medicine, Wellington Clinical School, University of Otago, New Zealand
Sue Peters
Affiliation:
Department of Medicine, Wellington Clinical School, University of Otago, New Zealand
Anne Fisher
Affiliation:
Department of Medicine, Wellington Clinical School, University of Otago, New Zealand
E. W. Pomare
Affiliation:
Department of Medicine, Wellington Clinical School, University of Otago, New Zealand
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Abstract

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1. Randomized cross-over studies were undertaken to determine the effects of daily dietary supplements of pectin (12 g/d), cellulose (15 g/d) and lignin (12 g/d) on stool characteristics of healthy volunteers.

2. Detailed dietary records were kept throughout the study. Stool collections over 48 h were used to determine mean stool pH and weight. The single stool transit time was measured using radio-opaque markers.

3. Pectin did not significantly alter the mean stool pH, transit time or 24 h wet weight.

4. Cellulose lowered the mean stool pH from 6·38 to 6·12, decreased mean stool transit time by 27% and increased mean wet stool weight by 57%.

5. Lignin lowered the mean pH from 6·34 to 6·25, decreased the stool transit time by 20% and increased stool weight by 27% but these changes were not statisticallysignificant.

6. These findings have shown that individual fibre components have different colonic metabolic effects and support the view that associations between dietary fibre intakes anddiseases such as colorectal cancer should be evaluated with regard to the type of fibrecomponents consumed.

Type
Papers of direct relevance to Clinical and Human Nutrition
Copyright
Copyright © The Nutrition Society 1983

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