Gut Microbiota Influences on Metabolic Disorders

The gut microbiota comprises a diverse community of bacteria, archaea, viruses and fungi that reside in the human gastrointestinal tract and profoundly shape host metabolism. A balanced microbiota contributes to energy harvest, vitamin synthesis and the regulation of intestinal barrier integrity. Alterations in community structure—often termed dysbiosis—have been linked to obesity, insulin resistance, non-alcoholic fatty liver disease and type 2 diabetes. Key microbial metabolites include short-chain fatty acids (SCFAs) such as acetate, propionate and butyrate, which arise from the fermentation of dietary fibre and act as signalling molecules to regulate appetite, glucose homeostasis and lipid metabolism. Bile acids are transformed by bacterial enzymes into secondary bile acids that interface with host nuclear receptors to modulate energy expenditure and inflammatory tone. Conversely, microbial conversion of choline into trimethylamine can exacerbate cardiovascular risk via trimethylamine N-oxide production. Low-grade metabolic endotoxaemia—driven by translocation of lipopolysaccharide into the circulation—promotes systemic inflammation and insulin insensitivity. The ratio of Firmicutes to Bacteroidetes has been associated with metabolic phenotypes in both animal models and clinical cohorts, although its use as a universal biomarker remains under refinement. Overall, current evidence underscores a reciprocal dialogue between diet, gut microbes and host pathways, offering novel avenues for precision nutrition and microbial therapeutics in the prevention and management of metabolic disorders.

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Gut Microbiota Influences on Metabolic Disorders publication trend

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

Technical terms

Gut microbiota: The community of microorganisms residing in the gastrointestinal tract, involved in nutrient metabolism and immune regulation.

Dysbiosis: An imbalance in microbial composition linked to disease states such as obesity and diabetes.

Short-chain fatty acids (SCFAs): Metabolic products of fibre fermentation by gut bacteria, including acetate, propionate and butyrate, which modulate host energy balance and inflammation.

Metabolic endotoxaemia: Low-grade inflammation induced by translocation of bacterial lipopolysaccharide into circulation, implicated in insulin resistance.

Firmicutes-to-Bacteroidetes ratio: A compositional marker of microbial balance, shifts of which are associated with obesity and metabolic dysfunction.

References

1. Consumption of Cooked Black Beans Stimulates a Cluster of Some Clostridia Class Bacteria Decreasing Inflammatory Response and Improving Insulin Sensitivity. Nutrients (2020).
2. Compositional Changes of the High-Fat Diet-Induced Gut Microbiota upon Consumption of Common Pulses. Nutrients (2021).
3. Navy Bean Supplementation in Established High-Fat Diet-Induced Obesity Attenuates the Severity of the Obese Inflammatory Phenotype. Nutrients (2021).