Eating about two servings of unsalted, skin-roasted peanuts a day for 16 weeks improved insulin responsiveness in memory-related regions of the brain in a small trial of 31 healthy adults aged 60 to 75, researchers at Maastricht University Medical Center in the Netherlands reported in the journal Food & Function.
The study measured a brain imaging marker, not memory, cognitive decline, or dementia. That distinction matters — a lot. The finding suggests a biological change that may be relevant to brain health, but it does not show that peanuts prevent memory loss.
