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Dietary Fiber in Bilberry Ameliorates Pre-Obesity Events in Rats by Regulating Lipid Depot, Cecal Short-Chain Fatty Acid Formation and Microbiota Composition
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Cell Biology.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Cell Biology, Integrative Physiology.
Univ Calif Davis, Dept Biochem & Mol Med, Sacramento, CA 95817 USA.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Cell Biology, Integrative Physiology.
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2019 (English)In: Nutrients, ISSN 2072-6643, E-ISSN 2072-6643, Vol. 11, no 6, article id 1350Article in journal (Refereed) Published
Abstract [en]

Obesity is linked to non-alcoholic fatty liver disease and risk factors associated to metabolic syndrome. Bilberry (Vaccinium myrtillus) that contains easily fermentable fiber may strengthen the intestinal barrier function, attenuate inflammation and modulate gut microbiota composition, thereby prevent obesity development. In the current study, liver lipid metabolism, fat depot, cecal and serum short-chain fatty acids (SCFAs) and gut microbiome were evaluated in rats fed bilberries in a high-fat (HFD + BB) or low-fat (LFD + BB) setting for 8 weeks and compared with diets containing equal amount of fiber resistant to fermentation (cellulose, HFD and LFD). HFD fed rats did not obtain an obese phenotype but underwent pre-obesity events including increased liver index, lipid accumulation and increased serum cholesterol levels. This was linked to shifts of cecal bacterial community and reduction of major SCFAs. Bilberry inclusion improved liver metabolism and serum lipid levels. Bilberry inclusion under either LFD or HFD, maintained microbiota homeostasis, stimulated interscapular-brown adipose tissue depot associated with increased mRNA expression of uncoupling protein-1; enhanced SCFAs in the cecum and circulation; and promoted butyric acid and butyrate-producing bacteria. These findings suggest that bilberry may serve as a preventative dietary measure to optimize microbiome and associated lipid metabolism during or prior to HFD.

Place, publisher, year, edition, pages
MDPI , 2019. Vol. 11, no 6, article id 1350
Keywords [en]
adipose tissue, bilberry, butyrate-producing bacteria, gut microbiota, hepatic steatosis, lipid metabolism, obesity-resistant, fermentation, prebiotic dietary fiber, short-chain fatty acids
National Category
Nutrition and Dietetics
Identifiers
URN: urn:nbn:se:uu:diva-390634DOI: 10.3390/nu11061350ISI: 000474936700156PubMedID: 31208043OAI: oai:DiVA.org:uu-390634DiVA, id: diva2:1344702
Funder
Swedish Research Council Formas, 222-2006-454Swedish Research CouncilSwedish Society for Medical Research (SSMF)Available from: 2019-08-21 Created: 2019-08-21 Last updated: 2019-08-21Bibliographically approved

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