Daily Peanuts Boost Brain Insulin Response in Older Adults — SkimNews
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- Maastricht University Medical Center researchers conducted a 16-week randomized controlled crossover trial with 31 adults aged 60–75, finding that daily peanut consumption enhanced insulin responsiveness in memory-related brain regions.
- Unsalted, skin-roasted peanuts consumed at 60 grams per day improved regional cerebral insulin sensitivity in the right hemisphere, including the hippocampus and posterior cingulate gyrus, after 16 weeks.
- Dr. Peter Joris reported that insulin plays a critical role in brain function, supporting memory and neuronal communication, and that age-related declines in brain insulin response may contribute to cognitive decline.
- ASL-MRI brain imaging was used to measure changes in cerebral blood flow following intranasal insulin administration, showing increased responsiveness in key memory areas after the peanut intervention.
- Peanut consumption in a prior 2025 study by the same team increased cerebral blood flow by 3.6% and improved verbal memory performance by 5.8%, reinforcing potential cognitive benefits.
- L-arginine and other bioactive compounds in peanuts, including unsaturated fats and phytochemicals, are proposed mechanisms for the observed brain health effects, according to the researchers.
Why it matters: Older adults may gain measurable cognitive benefits from a simple, low-cost dietary change: eating peanuts daily. The 3.6% increase in cerebral blood flow and improved insulin signaling—both linked to reduced Alzheimer’s risk—suggest a tangible, food-based intervention that could delay age-related memory decline without pharmaceuticals.
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