Microbiota Modulation through Dietary Fiber Interventions

The human gastrointestinal tract harbours a dense and diverse microbiota whose composition and metabolic activities are intimately linked to host health. Dietary fibres—non-digestible plant carbohydrates—reach the colon intact, where they serve as substrates for microbial fermentation. This process selectively enriches beneficial taxa, promotes inter-species metabolic cross-feeding and yields short-chain fatty acids (SCFAs) that reinforce epithelial integrity, modulate immune responses and influence systemic metabolism. Different fibre types, from high-molecular-weight arabinoxylans to oligosaccharides and inulin-type fructans, vary in solubility, polymer length and branching, determining their accessibility to specialised degraders and the spectrum of downstream consumers. Advances in multi-omics and in vitro fermentation systems have elucidated enzyme repertoires underpinning fibre breakdown, uncovered substrate-dependent shifts in key groups such as Bifidobacterium, Roseburia and Prevotella, and highlighted the importance of an individual’s baseline microbiota for predicting metabolic outcomes. Practical applications span personalised nutritional strategies for metabolic syndrome, the development of synbiotic formulations and the valorisation of agricultural by-products as functional ingredients. Overall, dietary fibre interventions offer a versatile, cost-effective means to steer the gut ecosystem towards configurations associated with improved metabolic, inflammatory and barrier functions.

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Microbiota Modulation through Dietary Fiber Interventions publication trend

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Technical terms

Microbiota: The community of microorganisms colonising a defined environment, notably the human gut.

Dietary fibre: Non-digestible plant carbohydrates that escape upper-gut digestion and undergo fermentation in the colon.

Prebiotic: A substrate selectively utilised by host microorganisms conferring a health benefit.

Short-chain fatty acids (SCFAs): Fermentation end products (e.g. acetate, propionate, butyrate) that support epithelial health and systemic physiology.

Arabinoxylan-oligosaccharides (AXOS): Oligomeric fragments of arabinoxylan acting as fermentable prebiotics with structure-dependent microbial specificity.

Cross-feeding: Metabolic interaction in which one microbial species utilises metabolites produced by another species.

References

1. Structure-dependent stimulation of gut bacteria by arabinoxylo-oligosaccharides (AXOS): a review. Gut Microbes (2024).
2. Physicochemical characterization and microbiota modulatory potential of brewer’s spent grain and arabinoxylan-derived fractions: A valorization study. LWT (2023).
3. Gut microbiota modulation with long-chain corn bran arabinoxylan in adults with overweight and obesity is linked to an individualized temporal increase in fecal propionate. Microbiome (2020).