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Title: A Polyphenol-Rich Diet Increases the Gut Microbiota Metabolite Indole 3-Propionic Acid in Older Adults with Preserved Kidney Function
Author: Peron, Gregorio
Meroño, Tomás
Gargari, Giorgio
Miñarro Alonso, Antonio
Vegas Lozano, Esteban
Castellano Escuder, Pol
González-Domínguez, Raúl
Del Bo, Cristian
Bernardi, Stefano
Kroon, Paul A.
Cherubini, Antonio
Riso, Patrizia
Guglielmetti, Simone
Andrés Lacueva, Ma. Cristina
Issue Date: 22-Mar-2022
Publisher: Wiley-VCH
Abstract: Scope: Dietary polyphenols can alter the gut microbiota (GM) and promote the production of bioactive metabolites. Several indoles result of GM metabolism of dietary tryptophan have been associated with intestinal barrier integrity. Our aim is to study the changes in GM-derived indoles during a polyphenol-rich (PR) diet intervention in older adults. Methods and results: Randomized, controlled, crossover trial in adults ≥ 60 years living in a residential care facility during an 8-week PR versus control diet (n = 51). Seven GM-tryptophan metabolites are measured in serum, and metataxonomic analysis of GM is performed on fecal samples. Exploratory subgroup analyses are performed based on renal function (RF). The PR-diet significantly increases serum indole 3-propionic acid (IPA) in subjects with normal RF, but not in subjects with impaired RF. Other GM-tryptophan metabolites are not affected. Comparison of baseline GM composition shows shifts in Bacteroidales order members as well as higher abundance of Clostridiales in participants with normal RF. During the trial, variations of IPA are associated with changes in C-reactive protein (β = 0.32, p = 0.010) and GM, particularly with the Clostridiales (r = 0.35, p < 0.001) and Enterobacteriales (r = -0.15, p < 0.05) orders. Conclusion: A PR diet increases the serum concentration of IPA in older adults with normal RF. Our findings may be important when defining appropriate dietary interventions for older adults.
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It is part of: Molecular Nutrition & Food Research, 2022
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ISSN: 1613-4125
Appears in Collections:Articles publicats en revistes (Nutrició, Ciències de l'Alimentació i Gastronomia)

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