The Impact of a 24-h Low and High Fermentable Oligo- Di- Mono-Saccharides and Polyol (FODMAP) Diet on Plasma Bacterial Profile in Response to Exertional-Heat Stress

Overview

Journal Nutrients

Date 2023 Aug 12

PMID 37571312

Authors

Stephanie K Gaskell

Kayla Henningsen

Pascale Young

Paul Gill

Jane Muir

Rebekah Henry

Ricardo J S Costa

Affiliations

Soon will be listed here.

Abstract

Exertional-heat stress (EHS) compromises intestinal epithelial integrity, potentially leading to the translocation of pathogenic agents into circulation. This study aimed to explore the impact of EHS on the systemic circulatory bacterial profile and to determine the impact of a short-term low (LFOD) and high (HFOD) fermentable oligo- di- mono-saccharide and polyol dietary intervention before EHS on this profile. Using a double-blind randomized cross-over design, thirteen endurance runners ( = 8 males, = 5 females), with a history of exercise-associated gastrointestinal symptoms (Ex-GIS), consumed a 24 h LFOD and HFOD before 2 h running at 60% V.O in 35.6 °C. Blood and fecal samples were collected pre-EHS to determine plasma microbial DNA concentration, and sample bacteria and short chain fatty acid (SCFA) profiles by fluorometer quantification, 16S rRNA amplicon gene sequencing, and gas chromatography, respectively. Blood samples were also collected post-EHS to determine changes in plasma bacteria. EHS increased plasma microbial DNA similarly in both FODMAP trials (0.019 ng·μL to 0.082 ng·μL) ( < 0.01). Similar pre- to post-EHS increases in plasma (+1.6%) and (+0.6%) phyla relative abundance were observed in both FODMAP trials. This included increases in several genus ( and ) groups. LFOD presented higher fecal (74%) and lower (10%) relative abundance pre-EHS, as a result of an increase in and family and respective genus groups, compared with HFOD (64% and 25%, respectively). Pre-EHS plasma total SCFA ( = 0.040) and acetate ( = 0.036) concentrations were higher for HFOD (188 and 178 μmol·L, respectively) vs. LFOD (163 and 153 μmol·L, respectively). Pre-EHS total fecal SCFA concentration (119 and 74 μmol·g; < 0.001), including acetate (74 and 45 μmol·g; = 0.001), butyrate (22 and 13 μmol·g; = 0.002), and propionate (20 and 13 μmol·g; = 0.011), were higher on HFOD vs LFOD, respectively. EHS causes the translocation of whole bacteria into systemic circulation and alterations to the plasma bacterial profile, but the FODMAP content of a 24 h diet beforehand does not alter this outcome.

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