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.

Autor:	Ng HM; Department of Medicine, University of Otago, Christchurch, Christchurch, New Zealand.; High-Value Nutrition National Science Challenge, Auckland, New Zealand., Maggo J; Department of Medicine, University of Otago, Christchurch, Christchurch, New Zealand.; High-Value Nutrition National Science Challenge, Auckland, New Zealand., Wall CL; Department of Medicine, University of Otago, Christchurch, Christchurch, New Zealand.; High-Value Nutrition National Science Challenge, Auckland, New Zealand., Bayer SB; Department of Medicine, University of Otago, Christchurch, Christchurch, New Zealand.; High-Value Nutrition National Science Challenge, Auckland, New Zealand., McNabb WC; High-Value Nutrition National Science Challenge, Auckland, New Zealand.; Riddet Institute, Massey University, Palmerston North, New Zealand., Mullaney JA; High-Value Nutrition National Science Challenge, Auckland, New Zealand.; Riddet Institute, Massey University, Palmerston North, New Zealand.; AgResearch Grasslands, Palmerston North, New Zealand., Foster M; High-Value Nutrition National Science Challenge, Auckland, New Zealand.; Riddet Institute, Massey University, Palmerston North, New Zealand.; Edible Research, Christchurch, New Zealand., Cabrera DL; High-Value Nutrition National Science Challenge, Auckland, New Zealand.; Plant and Food Research, Palmerston North, New Zealand., Fraser K; High-Value Nutrition National Science Challenge, Auckland, New Zealand.; Riddet Institute, Massey University, Palmerston North, New Zealand.; AgResearch Grasslands, Palmerston North, New Zealand., Cooney J; High-Value Nutrition National Science Challenge, Auckland, New Zealand.; Plant and Food Research, Ruakura Research Centre, Hamilton, New Zealand., Trower T; High-Value Nutrition National Science Challenge, Auckland, New Zealand.; Plant and Food Research, Ruakura Research Centre, Hamilton, New Zealand., Günther CS; High-Value Nutrition National Science Challenge, Auckland, New Zealand.; Plant and Food Research, Ruakura Research Centre, Hamilton, New Zealand., Frampton C; Biostatistics and Computational Biology Unit, University of Otago, Christchurch, Christchurch, New Zealand., Gearry RB; Department of Medicine, University of Otago, Christchurch, Christchurch, New Zealand.; High-Value Nutrition National Science Challenge, Auckland, New Zealand., Roy NC; High-Value Nutrition National Science Challenge, Auckland, New Zealand.; Riddet Institute, Massey University, Palmerston North, New Zealand.; Department of Human Nutrition, University of Otago, Dunedin, New Zealand.
Jazyk:	angličtina
Zdroj:	JMIR research protocols [JMIR Res Protoc] 2024 Aug 29; Vol. 13, pp. e59227. Date of Electronic Publication: 2024 Aug 29.
DOI:	10.2196/59227
Abstrakt:	Background: 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. (©Hwei Min Ng, Jasjot Maggo, Catherine Louisa Wall, Simone Brigit Bayer, Warren C McNabb, Jane Adair Mullaney, Meika Foster, Diana L Cabrera, Karl Fraser, Janine Cooney, Tania Trower, Catrin S Günther, Chris Frampton, Richard Blair Gearry, Nicole Clemence Roy. Originally published in JMIR Research Protocols (https://www.researchprotocols.org), 29.08.2024.)
Databáze:	MEDLINE
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