We know that fibre-rich foods are good for us. But this is down to a more complex process than most people realise. When gut bacteria break down fibre, they produce a group of compounds called short-chain fatty acids, or SCFAs. These are not just a byproduct of digestion. They are among the most important molecules our gut produces, and their effects extend far beyond the digestive system.
What are short-chain fatty acids?
SCFAs are small molecules produced when gut bacteria ferment dietary fibre in the colon. The three main types are butyrate, propionate and acetate. Each plays a different role, but together they influence gut barrier function, immune regulation, metabolic health and even brain function.
Why are they important?
The effects of short-chain fatty acids extend far beyond digestion. They strengthen the gut lining, reduce inflammation, support immune responses and communicate with the brain via the gut-brain axis. Research also suggests they play a role in skin and eye health. In short, SCFAs are one of the key ways the gut microbiome communicates with and influences the rest of the body.
What Happens When SCFA Levels Drop?
When the gut microbiome becomes imbalanced, SCFA production decreases. As a result, the gut barrier can weaken, allowing inflammatory signals to enter the bloodstream and affect multiple systems throughout the body. Low SCFA levels have been associated with conditions such as inflammatory bowel disease, metabolic disorders, skin conditions and chronic inflammation affecting the eyes.
This is one reason why the effects of dysbiosis often extend far beyond the digestive system.
What Can You Do?
Supporting the right gut bacteria is a good place to start. Fibre-rich foods provide the fuel these microbes need to produce SCFAs. However, for people dealing with persistent or more complex health concerns, diet alone may not always be enough.
Unlike many nutrients, SCFAs cannot simply be taken as a supplement. They need to be produced within the gut by the microbiome itself. This is exactly where Enbiosis focuses, supporting the microbiome pathways that make that production possible.
References
- Xiong, R. G., et al. (2022). Health benefits and side effects of short-chain fatty acids. Foods, 11(18), 2863.
- Zhang, D., et al. (2023). Short-chain fatty acids in diseases. Cell Communication and Signaling, 21(1), 212.
- Mann, E. R., Lam, Y. K., & Uhlig, H. H. (2024). Short-chain fatty acids: linking diet, the microbiome and immunity. Nature Reviews Immunology, 24(8), 577-595.
- Mukhopadhya, I., & Louis, P. (2025). Gut microbiota-derived short-chain fatty acids and their role in human health and disease. Nature Reviews Microbiology, 23(10), 635-651.
