Recent research suggests that the human gastrointestinal microbiota is greatly involved in yielding, storing and expending energy from the diet; therefore, it may be a further factor in linking diet to obesity. The gut microbial composition is affected by diet throughout the human lifespan, and is highly dynamic and efficient in response to dietary alterations in particular to dietary fibre intake. Short-chained fatty acids (SCFA) are the bi-product of fibre fermentation and have both obesogenic and anti-obesogenic properties. The production of specific forms of SCFAs depends on the microbes available in the gut and the type of fibre ingested. The gut microbiome associated with healthy lean individuals has a higher microbial biodiversity and a greater Bacteroidete to Firmicute ratio compared to the obese individuals associated with microbiome. These gut microbial associations are similar to those seen in individuals with high and low dietary fibre intakes, respectively. Metabolites generated by Bacteroidetes and Firmicutes include the three main SCFA related to obesity, namely butyrate, acetate and propionate. However, neither Bacteroidetes nor Firmicutes is purely causative or purely preventative of obesity. More research is crucial in linking the various types of fibre with particular SCFA production and the microbiome it promotes before suggesting that dietary fibre modulation of the gut microbiome can treat obesity. However, the long-term dietary trend plays the principal role in assembling the diversity and abundance of gut microbes; thus, a sustained diet high in fibre may help prevent obesity by promoting a microbiome associated with a lean phenotype.
Fibre Fibre and health Fibre and obesity Gastrointestinal health Gut health Gut microbiome Gut microbiota Obesity Obesity and gut health Obesity and gut microbiota SCFA SCFA and fibre SCFA and gut health SCFA and obesity Short-chain fatty acids
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The author is grateful to Professor Derek Doherty and Dr. Henry Windle in the MSc. Molecular Medicine course, Trinity College Dublin, for their support during the writing of this review. The author would also like to thank the reviewer for the kind comments that greatly improved this manuscript.
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Conflict of interest
The author declares that she has no conflict of interest.
This article does not contain any studies with human participants or animals performed by the author.
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