Scientists Discover a Vagus Nerve Signal That Links Food Directly to Memory Formation

A rat study links calorie-rich food to memory formation through a gut-to-brain signal.

Researchers found fats and sugars activate the vagus nerve, boosting acetylcholine in the medial septum and supporting hippocampal activity.

The effect depended on calories, not taste, and disappeared when the neural pathway was disrupted.

Rats raised on a Western junk-food diet showed a weaker version of this memory-supporting system.