From Our Neurons to Yours Could boosting gut–brain communication prevent memory loss? A tale of microbes, memory, and our internal senses | Christophe Thaiss
Mar 19, 2026
Christoph Thaiss, assistant professor and ARC Institute investigator studying gut–brain interactions. He discusses how age-related microbiome shifts can blunt internal bodily signals and alter vagus nerve communication. Conversations cover experiments linking aged microbes to memory loss in mice, identification of a culprit bacterium, inflammatory pathways that mute vagal signaling, and potential therapies like vagal stimulation and drugs.
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Gut Changes Suppress Hippocampal Engram Formation
- Age reduces hippocampal engram formation, weakening memory encoding.
- Thaiss shows microbiome manipulations suppress hippocampal neuronal activation, linking gut state to engram decline.
Sensory Regions Lose Input During Gastrointestinal Aging
- Aging microbiome changes mainly reduce sensory-region activity beyond the hippocampus.
- Brainstem and somatosensory cortex showed altered neuronal activity, suggesting diminished interoceptive signaling with age.
Vagus Nerve Is The Key Gut–Brain Highway Here
- The vagus nerve, not spinal afferents, is the primary pathway linking GI changes to the brain in this study.
- Multiple genetic manipulations pointed to vagal signaling as necessary for the microbiome-driven cognitive effects.