Gut Microbiota Modulation by Dietary Fibers
Summary
The gut microbiota comprises a complex ecosystem of microorganisms that contribute to host nutrition, immune regulation and barrier integrity. Dietary fibres are diverse non-digestible carbohydrates that resist small intestinal digestion and are fermented by colonic bacteria, yielding short-chain fatty acids (SCFAs) such as acetate, propionate and butyrate. These metabolites serve as energy sources for colonocytes, modulate systemic metabolism and influence inflammatory pathways. Among fibres, inulin, pectins and various forms of resistant starch differ in chemical structure, fermentability and selectivity for microbial taxa. By selectively enriching beneficial genera such as Bifidobacterium and Ruminococcus, fibre interventions can restore microbial balance, enhance mucosal defences and ameliorate metabolic dysfunction. Recent emphasis on precision nutrition highlights the need to tailor fibre type and dosage to individual microbial signatures, thereby maximising therapeutic efficacy and reducing inter-individual variability.
Research from Nature Portfolio
Recent clinical investigations have demonstrated that eight weeks of resistant starch supplementation in overweight or obese individuals produces significant weight reduction and improved insulin sensitivity. These improvements were associated with an increase in Bifidobacterium adolescentis, shifts in bile acid profiles, reinforcement of the intestinal barrier and decreased lipid absorption, confirming the pivotal role of the microbiota in mediating metabolic benefits. In a parallel trial of normal-weight volunteers, daily intake of resistant starch type 2 led to reductions in both visceral and subcutaneous fat areas, elevated circulating acetate and enhanced early-phase insulin and glucagon-like peptide 1 secretion. These effects correlated with changes in Ruminococcaceae_UCG-005 and Akkermansia, underscoring the potential of tailored fibre regimens to modulate body composition and host physiology.
Gut Microbiota Modulation by Dietary Fibers publication trend
The graph below shows the total number of articles in gut microbiota modulation by dietary fibers across all publications each year (not limited to Nature Index journals).
Technical terms
Gut microbiota: The community of microorganisms, including bacteria, archaea and viruses, residing in the gastrointestinal tract.
Dietary fibres: Non-digestible plant-derived carbohydrates that resist digestion in the small intestine and undergo fermentation by colon microbes.
Resistant starch: A form of dietary fibre composed of starch fractions that escape small intestinal digestion and are fermented by colonic bacteria.
Short-chain fatty acids (SCFAs): Metabolic by-products of microbial fermentation of dietary fibres—principally acetate, propionate and butyrate—that influence host energy metabolism and immune signalling.
References
- Resistant starch intake facilitates weight loss in humans by reshaping the gut microbiota. Nature Metabolism (2024).
- Gut microbial features and dietary fiber intake predict gut microbiota response to resistant starch supplementation. Gut Microbes (2024).
- Resistant Starches Types 2 and 4 Have Differential Effects on the Composition of the Fecal Microbiota in Human Subjects. PLOS ONE (2010).
- Metabolic phenotypes and the gut microbiota in response to dietary resistant starch type 2 in normal-weight subjects: a randomized crossover trial. Scientific Reports (2019).
- Resistant starch, microbiome, and precision modulation. Gut Microbes (2021).
- How to Feed the Mammalian Gut Microbiota: Bacterial and Metabolic Modulation by Dietary Fibers. Frontiers in Microbiology (2017).
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