USC Study Finds Vagus Nerve Boosts Food Memory in Rats, While High-Fat Diets Weaken It
Updated
Updated · ScienceDaily · Jul 29
USC Study Finds Vagus Nerve Boosts Food Memory in Rats, While High-Fat Diets Weaken It
3 articles · Updated · ScienceDaily · Jul 29
Summary
Nature Communications research found rats formed stronger food-location memories after nutrient-rich meals, while blocking the vagus nerve erased that boost and impaired recall.
Nutrient intake increased acetylcholine signaling in hippocampus-linked neurons, showing gut-to-brain messages—not sweetness alone—help the brain store food-related experiences.
Sweet low- or no-calorie liquids failed to trigger the same memory pathway, suggesting the brain distinguishes nutritional value from taste.
High-fat, high-sugar diets early in life later weakened gut-hippocampus communication and left rats with poorer food-memory performance even after returning to healthier diets.
The findings point to a possible mechanism linking poor nutrition, obesity and diabetes to cognitive decline, and may support future vagus-nerve-based memory therapies.