New Clues to MS: Gut Bacteria as a Trigger

New Clues to MS: Gut Bacteria as a Trigger

New Clues to MS: Gut Bacteria as a Trigger

Study link: https://www.pnas.org/doi/10.1073/pnas.2419689122

A new twin study has made a major breakthrough in understanding multiple sclerosis (MS). Researchers analyzed 81 identical twin pairs—one twin with MS, one without—to rule out genetic causes. What stood out: two gut bacteria, Eisenbergiella tayi and Lachnoclostridium, were found at significantly higher levels in the MS group. These bacteria live in the small intestine and, when fiber intake is low, they begin degrading the protective gut mucus layer. That leads to immune activation and ultimately to an attack on the body’s own myelin.

To prove causality, researchers transferred gut microbes from MS-affected twins into mice. The result: over 60% of the mice developed MS-like symptoms, including spinal cord lesions. The effect was stronger in females, which mirrors the real-world distribution of MS.

Instead of only using immunosuppressants, this research opens the door to new, gut-focused approaches. Possible strategies include:

– High-fiber diets to protect gut lining
– Probiotics and fermented foods to restore balance
– Selective antibiotics like rifaximin
– Bacteriophage therapy to target harmful strains
– Short-chain fatty acids like butyrate to reduce inflammation
– Avoiding processed foods

This study shifts the focus: from suppressing symptoms to modifying the root cause in the gut. It’s a powerful reminder that gut health is central to immune balance—especially in autoimmune diseases like MS.