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Medicine 2026-03-11

Aging Gut Bacteria Silence the Vagus Nerve, and Memory Fades With It

Researchers at Arc Institute and Stanford traced memory loss in aging mice to Parabacteroides goldsteinii, a gut bacterium that produces metabolites triggering inflammation that silences vagus nerve signaling to the hippocampus. GLP-1 agonists and vagus nerve stimulation restored youthful cognition.
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