Dietary Fiber Modulation of Gut Microbiota in Obesity Management

Dietary fibre exerts a profound influence on the structure and function of the gut microbiota, with direct implications for energy balance, metabolic health and inflammatory tone in obesity. Fermentable fibres are metabolised by specific microbial consortia to yield short-chain fatty acids (SCFAs) that regulate host appetite, insulin sensitivity and lipid oxidation. Distinct fibre types recruit different microbial taxa, shifting the ratio of Firmicutes to Bacteroidetes and enriching keystone genera such as Bifidobacterium and Akkermansia. This modulation of microbial metabolism also supports gut barrier integrity, attenuates endotoxaemia and influences nuclear receptor pathways, including peroxisome proliferator-activated receptors (PPARs). Advances in multi-omics have revealed fibre-specific enzymatic networks within the microbiome that drive individualised responses to dietary interventions. Collectively, these findings underscore the global significance of harnessing dietary fibre as a precision tool to reshape the gut ecosystem and ameliorate obesity and its metabolic sequelae.

Research from Nature Portfolio

Recent studies have demonstrated that supplementation with oat β-glucan in adults with overweight or obesity leads to significant reductions in body weight and improvements in insulin sensitivity. These effects are mediated by enrichment of SCFA-producing Bacteroides species and increased faecal acetate and propionate concentrations, alongside enhanced gut barrier function. A comprehensive molecular investigation has mapped the polysaccharide utilisation loci across key gut microbes, revealing fibre-type specific enzymatic cascades that underpin selective microbial growth and SCFA output. These insights enable the design of tailored fibre interventions to promote leanness. Foundational animal work has further shown that bamboo shoot fibre exhibits superior anti-obesogenic properties compared with cellulose, preventing weight gain in high-fat diet models by preserving microbial diversity, elevating Bacteroidetes abundance and suppressing Verrucomicrobia expansions linked to adiposity.

Dietary Fiber Modulation of Gut Microbiota in Obesity Management publication trend

The graph below shows the total number of articles in dietary fiber modulation of gut microbiota in obesity management across all publications each year (not limited to Nature Index journals).

Technical terms

Short-chain fatty acids (SCFAs): Fermentation products of dietary fibres by gut microbes that regulate host metabolism and inflammation.

Prebiotic: A selectively fermentable dietary component that stimulates growth or activity of beneficial gut bacteria.

Firmicutes/Bacteroidetes ratio: A marker of gut community composition often linked to energy harvest and obesity risk.

Microbiota-accessible carbohydrates (MACs): Complex polysaccharides indigestible by the host but utilised by gut microbes.

Polysaccharide utilisation loci (PULs): Gene clusters in certain gut bacteria encoding enzymes for specific fibre degradation.

Peroxisome proliferator-activated receptors (PPARs): Nuclear receptors modulated by microbial metabolites that control lipid and glucose metabolism.

References

1. Bamboo shoot fiber prevents obesity in mice by modulating the gut microbiota. Scientific Reports (2016).
2. Cooperative action of gut-microbiota-accessible carbohydrates improves host metabolic function. Cell Reports (2022).
3. Bamboo shoot dietary fiber alleviates gut microbiota dysbiosis and modulates liver fatty acid metabolism in mice with high-fat diet-induced obesity. Frontiers in Nutrition (2023).
4. Anti-Obesity Effects of Dietary Fibers Extracted from Flaxseed Cake in Diet-Induced Obese Mice. Nutrients (2023).