Gut-to-brain signals via the vagus nerve boost memory formation in rats
TL;DR Summary
A USC-led rat study shows a nutritious meal triggers a gut-to-brain signal via the vagus nerve that boosts acetylcholine release in the medial septum and hippocampus, strengthening memory-related brain activity; fats and sugars intensified the effect while a Western junk-food diet early in life weakened it. The effect depends on intact vagal afferents and septal acetylcholine neurons, and may not translate directly to humans, but points to gut-brain targets and vagus nerve stimulation as potential therapies—though further research is needed and the study used male rats only.
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