Scientists discover a surprising brain benefit of eating peanuts every day

A recent study conducted at Maastricht University Medical Center in the Netherlands has uncovered a potential brain benefit of incorporating peanuts into daily diets. The research, published in the peer-reviewed journal Food & Function, suggests that regularly consuming unsalted, skin-roasted peanuts may enhance insulin responsiveness in specific brain regions associated with memory in older adults.

Insulin, known primarily for regulating blood sugar, also plays a crucial role in the brain. It aids in nerve cell growth, survival, and communication, thereby supporting memory and cognitive abilities. Healthy insulin signaling may also protect against processes linked to Alzheimer's disease.

The study, led by Dr. Peter Joris, a senior author and associate professor in the Department of Nutrition and Movement Sciences, involved 31 healthy adults aged 60 to 75. Participants consumed 60 grams of unsalted, skin-roasted peanuts daily for 16 weeks as part of a randomized, controlled crossover trial. Researchers measured the effects on brain health using arterial spin labeling magnetic resonance imaging (ASL-MRI) and assessed insulin responsiveness by monitoring changes in regional cerebral blood flow after administering insulin through the nose.

The findings indicate that daily peanut consumption led to improved insulin responsiveness in memory-related brain regions, including the lingual gyrus, hippocampus, parahippocampal gyrus, and posterior cingulate gyrus. These areas contribute to memory-related processes. While peanuts contain multiple beneficial nutrients, including unsaturated fats, dietary fiber, vitamins, minerals, bioactive phytochemicals, and L-arginine, the study suggests that several components, not just one nutrient, may contribute to the observed brain health benefits.