Cited by 232Gut microbiota and healthMicrobial Metabolites in Food BiotechnologyAdipokines, Inflammation, and Metabolic Diseases

Gut microbiota and energy balance: role in obesity

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Blaut, Michael·2015·Proceedings of The Nutrition Society

Abstract

The microbial community populating the human digestive tract has been linked to the development of obesity, diabetes and liver diseases. Proposed mechanisms on how the gut microbiota could contribute to obesity and metabolic diseases include: (1) improved energy extraction from diet by the conversion of dietary fibre to SCFA; (2) increased intestinal permeability for bacterial lipopolysaccharides (LPS) in response to the consumption of high-fat diets resulting in an elevated systemic LPS level and low-grade inflammation. Animal studies indicate differences in the physiologic effects of fermentable and non-fermentable dietary fibres as well as differences in long- and short-term effects of fermentable dietary fibre. The human intestinal microbiome is enriched in genes involved in the degradation of indigestible polysaccharides. The extent to which dietary fibres are fermented and in which molar ratio SCFA are formed depends on their physicochemical properties and on the individual microbiome. Acetate and propionate play an important role in lipid and glucose metabolism. Acetate serves as a substrate for de novo lipogenesis in liver, whereas propionate can be utilised for gluconeogenesis. The conversion of fermentable dietary fibre to SCFA provides additional energy to the host which could promote obesity. However, epidemiologic studies indicate that diets rich in fibre rather prevent than promote obesity development. This may be due to the fact that SCFA are also ligands of free fatty acid receptors (FFAR). Activation of FFAR leads to an increased expression and secretion of enteroendocrine hormones such as glucagon-like-peptide 1 or peptide YY which cause satiety. In conclusion, the role of SCFA in host energy balance needs to be re-evaluated.

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  1. Cummings JH (1994) Anatomy and physiology of the human colon. ILSI Workshop on Colonic Microflora: Nutrition and Health.

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Authors
Blaut, M.
Venue
Proceedings of The Nutrition Society
Published
2014-12-18
Volume
74
Issue
3
Pages
227-234
ISSN
  • 0029-6651 (ISSN-L)
  • 1475-2719
OpenAlex
W2147152358
Cited by
232
References
54
Citations by year
2026: 13 · 2025: 11 · 2024: 15 · 2023: 24 · 2022: 34 · 2021: 25 · 2020: 23 · 2019: 22 · 2018: 22 · 2017: 16 · 2016: 21 · 2015: 6
FWCI
5.87
Type
journal article
Language
en
Open access
Locations
  • Proceedings of The Nutrition Society (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gut microbiota and health
  • Health Sciences › Nursing › Nutrition and Dietetics › Microbial Metabolites in Food Biotechnology
  • Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
Keywords
gut microbiota, obesity, energy balance, short-chain fatty acids, dietary fiber fermentation, intestinal permeability, lipopolysaccharide, low-grade inflammation, acetate, propionate, de novo lipogenesis, gluconeogenesis, free fatty acid receptors, enteroendocrine hormones, glucagon-like peptide-1, peptide YY, satiety, high-fat diet
MeSH terms
Gastrointestinal Microbiome, Animals, Dietary Fiber, Energy Metabolism, Fatty Acids, Volatile, Glucose, Humans, Inflammation, Intestinal Mucosa, Intestines, Lipopolysaccharides, Obesity, Permeability, Satiation, Peptide YY, Lipid Metabolism, Glucagon-Like Peptide 1, Incretins

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