דיווחים מציינים שמתmeals rich in nutrition might help the brain form lasting memories. This effect is linked to signals traveling from the gut to the brain via the vagus nerve, which was observed in rats who showed better memory after consuming nutritious meals compared to drinking sweet liquids with little nutritional value. Blocking the vagus nerve erased this effect and made it harder for animals to remember where food had been located. Over time, diets high in fat and sugar weakened this memory system.
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