Dietary Influences on Gut Microbiota Composition

The gut microbiota, the diverse community of bacteria, archaea, fungi and viruses residing in the gastrointestinal tract, is profoundly shaped by habitual food intake. Diets rich in plant-based fibres, polyphenols and unsaturated fats foster the proliferation of beneficial taxa that ferment substrates into short-chain fatty acids, which support mucosal integrity, immune modulation and energy homeostasis. In contrast, Western-style diets high in saturated fats, refined sugars and low in fibre can reduce microbial diversity, promote dysbiosis and exacerbate inflammatory pathways. Emerging evidence indicates that even brief dietary shifts can rapidly alter both microbial composition and host lipid mediators, with implications for metabolic health, immune function and disease risk. Advances in precision nutrition aim to tailor dietary interventions to individual microbial profiles, offering potential strategies for preventing non-communicable diseases and promoting healthy ageing on a global scale.

Research from Nature Portfolio

Controlled dietary interventions comparing vegan and ketogenic regimens over two weeks have revealed distinct impacts on microbial pathways and immune signatures. The ketogenic diet was associated with downregulation of most microbial metabolic pathways and enrichment of adaptive immune cells, whereas the vegan diet enhanced innate antiviral pathways. Integrated multiomic network analyses connected shifts in amino acid and lipid metabolites with specific microbial taxa, underscoring the interplay between diet, the microbiome and host immunity. In a separate six-month study of pre-diabetic individuals, personalised postprandial glucose-targeting diets were compared with standard Mediterranean care. These interventions induced significant alterations in gut microbial species and functional pathways, alongside changes in serum metabolites and cytokines. Compositional shifts in the microbiota explained over 10% of the variance in host metabolite profiles, highlighting the mediating role of gut microbes in dietary modulation of glycaemic control and immune response.

Dietary Influences on Gut Microbiota Composition publication trend

The graph below shows the total number of articles in dietary influences on gut microbiota composition across all publications each year (not limited to Nature Index journals).

Technical terms

Gut microbiota: the community of bacteria, archaea, fungi and viruses inhabiting the gastrointestinal tract.

Dysbiosis: a perturbation or imbalance in the gut microbial community linked to impaired host health.

Short-chain fatty acids (SCFAs): metabolites such as acetate, propionate and butyrate produced by microbial fermentation of dietary fibre.

Branched-chain fatty acids (BCFAs): fatty acids with branched aliphatic chains generated by microbial metabolism of branched-chain amino acids.

Endocannabinoidome: the ensemble of lipid mediators, receptors and enzymes that modulate host–microbe signalling pathways.

Multiomics: the integrated analysis of multiple high-throughput data sets, including genomics, transcriptomics, proteomics and metabolomics.

References

1. Differential peripheral immune signatures elicited by vegan versus ketogenic diets in humans. Nature Medicine (2024).
2. Impact of dietary interventions on pre-diabetic oral and gut microbiome, metabolites and cytokines. Nature Communications (2023).
3. The diet rapidly and differentially affects the gut microbiota and host lipid mediators in a healthy population. Microbiome (2023).
4. Dietary therapies interlinking with gut microbes toward human health: Past, present, and future. iMeta (2024).