Researchers at Maastricht University Medical Center have identified that daily consumption of 60 grams of unsalted, skin-roasted peanuts may enhance the brain’s insulin responsiveness in older adults. Published this week in the journal Food & Function, the trial suggests a potential link between nut intake and improved function in memory-associated brain regions.
Clinical Implications for Brain Health
The study, led by the Institute of Nutrition and Translational Research in Metabolism (NUTRIM), involved 31 healthy participants aged 60 to 75. Over a 16-week period, subjects consumed a daily portion of peanuts, which were then compared against a control period of non-consumption. Using arterial spin labeling magnetic resonance imaging (ASL-MRI)—a technique that tracks blood flow to map brain activity—investigators observed measurable changes in the right hemisphere. Specifically, insulin responsiveness improved within the hippocampus, parahippocampal gyrus, lingual gyrus, and posterior cingulate gyrus, all of which are critical to cognitive processing and memory.
As noted by Euronews, these findings build upon a 2025 study from the same research team published in Clinical Nutrition. That earlier work established that the same 16-week dietary intervention increased global cerebral blood flow by 3.6% and resulted in a 5.8% improvement in verbal memory performance. Dr. Peter Joris, the study’s senior author, emphasized that as the brain ages, its sensitivity to insulin—a hormone essential for nerve cell communication and metabolic health—often declines, a process frequently correlated with cognitive impairment.
In Plain English: The Clinical Takeaway
- Insulin Sensitivity: Insulin is not just for blood sugar; it helps fuel brain cells. Better “responsiveness” means the brain can use this hormone more efficiently to support learning and memory.
- Mechanisms of Action: Peanuts contain L-arginine, an amino acid the body converts into nitric oxide. Nitric oxide helps relax and widen blood vessels, potentially increasing the delivery of oxygen and nutrients to brain tissue.
- Nutrient Density: The observed benefits are likely linked to the complex profile of peanuts, which provide unsaturated fats, dietary fiber, and various bioactive plant compounds (phytochemicals) that support vascular health.
Research Scope and Data Summary
The study utilized a randomized, controlled crossover design, which is considered a robust method for minimizing individual variability in clinical research. By having each participant serve as their own control, the researchers could isolate the specific effects of the peanut intervention. However, the study size remains small (N=31), and the researchers caution that these results do not constitute evidence that peanuts prevent Alzheimer’s disease or other forms of dementia. Further longitudinal studies with larger, more diverse cohorts are required to determine if these metabolic changes translate to long-term cognitive protection.
Scientists Discover That Eating Peanuts Every Day May Help Protect the Aging Brain | The Peanut Institute, SciTechDailyA daily serving of peanuts may improve insulin sensitivity in the aging brain, potentially supporting memory.Peanuts may offer more than a convenient source… pic.twitter.com/5YM4kxf3cE
| Metric | Observed Outcome | Context |
|---|---|---|
| Study Duration | 16 Weeks | Controlled dietary intervention |
| Cerebral Blood Flow | +3.6% | Reported in 2025 (Clinical Nutrition) |
| Verbal Memory | +5.8% | Performance improvement |
| Target Regions | Right Hemisphere | Hippocampus & Cingulate Gyrus |
Funding and Transparency
The research was supported by funding from The Peanut Institute Foundation. According to the disclosures provided in Food & Function, the funding body did not participate in the study design, data collection, statistical analysis, or the writing of the manuscript. The study was conducted independently by the NUTRIM team at Maastricht University Medical Center.
References
- Joris, P. J., et al. (2026). “Daily consumption of unsalted, skin-roasted peanuts improves brain insulin sensitivity in healthy older adults.” Food & Function.
- Maastricht University Medical Center (2025). “Impact of peanut intake on cerebral blood flow and cognitive performance.” Clinical Nutrition.
- The Peanut Institute Foundation. “Research Summary: Daily Peanut Consumption and Brain Health.”
