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Clin Nutr. 2019 Feb 19. pii: S0261-5614(19)30030-5. doi: 10.1016/j.clnu.2019.01.012. [Epub ahead of print]

Arabinoxylan oligosaccharides and polyunsaturated fatty acid effects on gut microbiota and metabolic markers in overweight individuals with signs of metabolic syndrome: A randomized cross-over trial.

Author information

1
Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, Rolighedsvej 26, 1958 Frederiksberg C, Denmark. Electronic address: louisekjoelbaek@nexs.ku.dk.
2
Microbial Ecology, Nutrition & Health Research Unit, Institute of Agrochemistry and Food Technology, Spanish National Research Council (IATA-CSIC), 46980, Paterna, Valencia, Spain. Electronic address: abenitez@iata.csic.es.
3
Microbial Ecology, Nutrition & Health Research Unit, Institute of Agrochemistry and Food Technology, Spanish National Research Council (IATA-CSIC), 46980, Paterna, Valencia, Spain.
4
Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, Rolighedsvej 26, 1958 Frederiksberg C, Denmark.
5
Institute of Clinical Chemistry and Laboratory Medicine, University of Regensburg, 93053 Regensburg, Germany.
6
Microbial Ecology of Health Unit, Department of Pharmacy and Biotechnology, University of Bologna, 40126 Bologna, Italy.
7
Cargill R&D Centre Europe, Havenstraat 84, B-1800 Vilvoorde, Belgium.

Abstract

BACKGROUND & AIMS:

Gut microbiota composition is linked to obesity and metabolic syndrome. The nutrients and doses required to modulate the gut microbiota towards beneficially influence components of the metabolic syndrome are unclear. This study aimed to investigate diet-induced effects on the gut microbiota and metabolic markers in overweight individuals with indices of the metabolic syndrome.

METHODS:

A twelve-week randomized cross-over trial was conducted with two intervention periods separated by a washout period. The dietary intakes of interest were wheat bran extract, rich in arabinoxylan oligosaccharides (AXOS) (10.4 g/d AXOS) and polyunsaturated fatty acids (PUFA) (3.6 g/d n-3 PUFA). Dietary records, fecal and blood samples, as well as anthropometric data, were collected before and after intervention. Anthropometry and gastrointestinal symptoms were evaluated weekly. Gut microbiota composition was analyzed by massive sequencing of 16S ribosomal RNA gene V3V4 amplicons.

RESULTS:

Twenty-seven participants completed the study (90%). Intake of AXOS induced an expected bifidogenic effect on gut microbiota (p < 0.01) and increased butyrate-producing bacterial species as well (p < 0.05). Beta-diversity analysis indicated that the structure of the gut microbiota only changed as a result of the AXOS intervention (Permanova = 1.90, p < 0.02) and no changes in metabolic markers were observed after any of the interventions.

CONCLUSIONS:

AXOS intake has a bifidogenic effect and also increases butyrate producers in the gut microbiota; even though this type of dietary fiber did not modulate lipid or glucose metabolic parameters related to metabolic syndrome. Four-week PUFA intake did not induce any notable effect on the gut microbiota composition or metabolic risk markers.

REGISTRATION:

Registered under ClinicalTrials.gov Identifier no. NCT02215343.

CLINICAL TRIAL REGISTRATION:

Registered at https://www.clinicaltrials.gov/ (NCT02215343).

ETHICAL COMMITTEE:

H-4-2014-052.

THE DANISH DATA PROTECTION AGENCY:

2013-54-0522.

KEYWORDS:

Arabinoxylan oligosaccharide; Fiber; Fish oil; Gut microbiota; Metabolic syndrome; Obesity

PMID:
30827722
DOI:
10.1016/j.clnu.2019.01.012

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