USC Study Links Vagus Nerve Signals to Memory in Rats, Published June 4
Updated
Updated · ThePrint · Jul 30
USC Study Links Vagus Nerve Signals to Memory in Rats, Published June 4
3 articles · Updated · ThePrint · Jul 30
Summary
USC Dornsife researchers found in rats that nutritious food boosts acetylcholine release in hippocampus-linked neurons, tying gut signals directly to memory formation.
Blocking the vagus nerve cut that acetylcholine response and left rats worse at remembering recent food sources, identifying the nerve as the key gut-brain pathway.
Sweet but low- or non-caloric liquids failed to trigger the same brain activity, suggesting the system responds to nutritional value rather than taste alone.
High-fat and high-sugar diets initially activated memory-related signaling but later weakened gut-hippocampus communication, with early-life exposure leaving lasting deficits even after healthier diets.
The study, published June 4 in Nature Communications, points to vagus nerve-based therapies because disrupted hippocampal acetylcholine signaling is an early change in Alzheimer's disease.