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    Abnormal fibre usage in UC in remission

    Access Status
    Fulltext not available
    Authors
    James, S.
    Christophersen, Claus
    Bird, A.
    Conlon, M.
    Rosella, O.
    Gibson, P.
    Muir, J.
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    James, S. and Christophersen, C. and Bird, A. and Conlon, M. and Rosella, O. and Gibson, P. and Muir, J. 2015. Abnormal fibre usage in UC in remission. Gut. 64 (4): pp. 562-570.
    Source Title
    Gut
    DOI
    10.1136/gutjnl-2014-307198
    ISSN
    0017-5749
    School
    School of Molecular and Life Sciences (MLS)
    URI
    http://hdl.handle.net/20.500.11937/71963
    Collection
    • Curtin Research Publications
    Abstract

    Objective Colonic fermentation in patients with UC in remission was compared with that in matched healthy subjects on habitual diets and when dietary fibre was increased. Design Fibre intake, faecal output of fibre (measured as non-starch polysaccharide (NSP)), starch, microbiota and fermentation products, and whole gut transit time (WGTT) were assessed in association with habitual diet and when dietary intake of wheat bran (WB)-associated fibre and high amylose-associated resistant starch (RS) was increased in an 8-week, randomised, single-blind, cross-over study. Results Despite a tendency to lower habitual fibre intake in UC patients, faecal NSP and starch concentrations were threefold higher than in controls, whereas concentrations of phenols and short-chain fatty acids, pH and WGTT were similar. Increasing RS/WB intake was well tolerated. In controls (n=10), it more than doubled faecal NSP and starch excretion (p=0.002 for both), had no effect on NSP usage and reduced WGTT (p=0.024). In UC patients (n=19), high intake of RS/WB tended to normalise gut transit, but did not increase the proportion of NSP fermented. Increasing intake of RS/WB had little effect on faecal fermentation patterns or the structure of the microbiota. However, faeces from the UC cohort had lower proportions of Akkermansia muciniphila and increased diversity within Clostridium cluster XIVa compared to controls. Conclusions Gut fermentation of NSP and starch is diminished in patients with UC. This cannot be explained by abnormal gut transit and was not corrected by increasing RS/WB intake, and may be due to abnormal functioning of the gut microbiota. Trial registration number Australian New Zealand Clinical Trials Registry: ACTRN12614000271606.

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