Effects of Defatted Rice Bran-Fortified Bread on the Gut Microbiota Composition of Healthy Adults With Low Dietary Fiber Intake: Protocol for a Crossover Randomized Controlled Trial

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dc.citation.volume13
dc.contributor.authorNg HM
dc.contributor.authorMaggo J
dc.contributor.authorWall CL
dc.contributor.authorBayer SB
dc.contributor.authorMcNabb WC
dc.contributor.authorMullaney JA
dc.contributor.authorFoster M
dc.contributor.authorCabrera DL
dc.contributor.authorFraser K
dc.contributor.authorCooney J
dc.contributor.authorTrower T
dc.contributor.authorGünther CS
dc.contributor.authorFrampton C
dc.contributor.authorGearry RB
dc.contributor.authorRoy NC
dc.coverage.spatialCanada
dc.date.accessioned2024-10-17T20:14:05Z
dc.date.available2024-10-17T20:14:05Z
dc.date.issued2024-08-29
dc.description.abstractBACKGROUND: Inadequate dietary fiber (DF) intake is associated with several human diseases. Bread is commonly consumed, and its DF content can be increased by incorporating defatted rice bran (DRB). OBJECTIVE: This first human study on DRB-fortified bread primarily aims to assess the effect of DRB-fortified bread on the relative abundance of a composite of key microbial genera and species in fecal samples. Secondary outcomes include clinical (cardiovascular risk profile), patient-reported (daily bread consumption and bowel movement, gut comfort, general well-being, and total DF intake), biological (fecal microbiota gene abundances, and fecal and plasma metabolites), and physiome (whole-gut and regional transit time and gas fermentation profiles) outcomes in healthy adults with low DF intake. METHODS: This is a 2-armed, placebo-controlled, double-blinded, crossover randomized controlled trial. The study duration is 14 weeks: 2 weeks of lead-in, 4 weeks of intervention per phase, 2 weeks of washout, and 2 weeks of follow-up. Overall, 60 healthy adults with low DF intake (<18 g [female individuals] or <22 g [male individuals] per day) were recruited in Christchurch, New Zealand, between June and December 2022. Randomly assigned participants consumed 3 (female individuals) or 4 (male individuals) slices of DRB-fortified bread per day and then placebo bread, and vice versa. The DRB-fortified bread provided 8 g (female individuals) or 10.6 g (male individuals) of total DF, whereas the placebo (a matched commercial white toast bread) provided 2.7 g (female individuals) or 3.6 g (male individuals) of total DF. Before and after each intervention phase, participants provided fecal and blood samples to assess biological responses; completed a 3-day food diary to assess usual intakes and web-based questionnaires to assess gut comfort, general and mental well-being, daily bread intake, and bowel movement via an app; underwent anthropometry and blood pressure measurements; and drank blue food dye to assess whole-gut transit time. Additionally, 25% (15/60) of the participants ingested Atmo gas-sensing capsules to assess colonic gas fermentation profile and whole-gut and regional transit time. Mean differences from baseline will be compared between the DRB and placebo groups, as well as within groups (after the intervention vs baseline). For metabolome analyses, comparisons will be made within and between groups using postintervention values. RESULTS: Preliminary analysis included 56 participants (n=33, 59% female; n=23, 41% male). Due to the large dataset, data analysis was planned to be fully completed by the last quarter of 2024, with full results expected to be published in peer-reviewed journals by the end of 2024. CONCLUSIONS: This first human study offers insights into the prospect of consuming DRB-fortified bread to effectively modulate health-promoting gut microbes, their metabolism, and DF intake in healthy adults with low DF intake. TRIAL REGISTRATION: Australian New Zealand Clinical Trials Registry ACTRN12622000884707; https://www.anzctr.org.au/Trial/Registration/TrialReview.aspx?id=383814. INTERNATIONAL REGISTERED REPORT IDENTIFIER (IRRID): DERR1-10.2196/59227.
dc.description.confidentialfalse
dc.format.paginatione59227-
dc.identifier.author-urlhttps://www.ncbi.nlm.nih.gov/pubmed/39207833
dc.identifier.citationNg HM, Maggo J, Wall CL, Bayer SB, McNabb WC, Mullaney JA, Foster M, Cabrera DL, Fraser K, Cooney J, Trower T, Günther CS, Frampton C, Gearry RB, Roy NC. (2024). Effects of Defatted Rice Bran-Fortified Bread on the Gut Microbiota Composition of Healthy Adults With Low Dietary Fiber Intake: Protocol for a Crossover Randomized Controlled Trial.. JMIR Res Protoc. 13. (pp. e59227-).
dc.identifier.doi10.2196/59227
dc.identifier.eissn1929-0748
dc.identifier.elements-typejournal-article
dc.identifier.issn1929-0748
dc.identifier.numbere59227
dc.identifier.piiv13i1e59227
dc.identifier.urihttps://mro.massey.ac.nz/handle/10179/71750
dc.languageeng
dc.publisherJMIR Publications
dc.publisher.urihttps://www.researchprotocols.org/2024/1/e59227
dc.relation.isPartOfJMIR Res Protoc
dc.subjectbread
dc.subjectdefatted rice bran
dc.subjectdietary fiber
dc.subjectgut microbiota
dc.subjectgut physiome
dc.subjecthealthy adults
dc.subjectmetabolites
dc.subjectmobile phone
dc.subjectrandomized controlled trial
dc.subjectHumans
dc.subjectBread
dc.subjectCross-Over Studies
dc.subjectOryza
dc.subjectDietary Fiber
dc.subjectMale
dc.subjectFemale
dc.subjectGastrointestinal Microbiome
dc.subjectAdult
dc.subjectFood, Fortified
dc.subjectDouble-Blind Method
dc.subjectMiddle Aged
dc.subjectFeces
dc.titleEffects of Defatted Rice Bran-Fortified Bread on the Gut Microbiota Composition of Healthy Adults With Low Dietary Fiber Intake: Protocol for a Crossover Randomized Controlled Trial
dc.typeJournal article
pubs.elements-id491414
pubs.organisational-groupOther
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