Short-Chain Fatty Acid Metabolism in Gastrointestinal Health

Short-chain fatty acids (SCFAs) are key microbial metabolites produced in the colon by bacterial fermentation of dietary fibres. The principal SCFAs—acetate, propionate and butyrate—serve as energy sources for colonocytes, shape the luminal pH and reinforce epithelial barrier integrity. Beyond their nutritive role, SCFAs engage G-protein-coupled receptors and epigenetic pathways to modulate local immune responses, mucosal blood flow and ion transport. Efficient SCFA uptake involves specialised transporters such as the monocarboxylate transporter family, while systemic distribution influences distant organs including the liver and brain. Disruptions in SCFA production or absorption associate with inflammatory bowel disease, colorectal cancer risk and metabolic syndrome. A detailed understanding of SCFA metabolism thus underpins strategies to restore gut homeostasis, ranging from dietary interventions to microbiome-targeted therapeutics.

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Short-Chain Fatty Acid Metabolism in Gastrointestinal Health publication trend

The graph below shows the total number of articles in short-chain fatty acid metabolism in gastrointestinal health across all publications each year (not limited to Nature Index journals).

Technical terms

Short-chain fatty acids (SCFAs): Saturated aliphatic carboxylic acids with fewer than six carbon atoms, principally acetate, propionate and butyrate, produced by bacterial fermentation in the colon.

Gut microbiota: The complex community of microorganisms residing in the gastrointestinal tract, responsible for nutrient metabolism, immune modulation and barrier function.

Fermentation: Anaerobic microbial breakdown of dietary substrates—mainly indigestible carbohydrates—to generate energy and metabolites such as SCFAs.

Synbiotic: A combination of prebiotic substrates and probiotic microorganisms designed to synergistically enhance gut microbial function and metabolite production.

Monocarboxylate transporter (MCT): A family of proton-coupled membrane proteins (e.g. MCT1) that facilitate the cellular uptake and export of monocarboxylates including lactate and SCFAs.

References

1. Houttuynia cordata Thunb. Extracts Alleviate Atherosclerosis and Modulate Gut Microbiota in Male Hypercholesterolemic Hamsters. Nutrients (2024).
2. Capacity of a Microbial Synbiotic To Rescue the In Vitro Metabolic Activity of the Gut Microbiome following Perturbation with Alcohol or Antibiotics. Applied and Environmental Microbiology (2023).
3. Impact of Glycosidic Bond Configuration on Short Chain Fatty Acid Production from Model Fermentable Carbohydrates by the Human Gut Microbiota. Nutrients (2017).