Scientists Discover Brain Benefits From Eating Peanuts Every Day

Daily Peanut Intake and Brain Health

Researchers have discovered that eating peanuts every day can offer surprising benefits for the aging brain. A scientific investigation conducted in the Netherlands found that regularly consuming unsalted, skin-roasted variants can improve how specific brain regions respond to insulin in older adults.

Although insulin is primarily known for regulating blood sugar, it also supports nerve cell growth, survival, and communication, which helps maintain memory and other cognitive functions. Healthy insulin signaling may also provide protection against processes tied to Alzheimer disease.

How the Study Was Conducted

The investigation involved 31 healthy adults ranging in age from 60 to 75. Utilizing a randomized, controlled crossover trial design, participants consumed 60 grams—roughly two servings—of peanuts daily for a period of 16 weeks, and completely avoided them during the control phase.

To monitor changes, scientists used advanced techniques such as arterial spin labeling magnetic resonance imaging to measure blood flow, alongside abdominal scans and computerized cognitive testing. Premeasured packets were provided to maintain consistent intake, allowing participants to eat them during the morning or afternoon according to their preference.

Brain Insulin Responsiveness and Blood Flow

After the 16-week intervention, specialists noted enhanced insulin responsiveness in right hemisphere brain areas associated with memory processes, including portions of the hippocampus, lingual gyrus, parahippocampal gyrus, and posterior cingulate gyrus.

These findings build upon earlier work published in 2025 by senior author Dr. Peter Joris, which revealed that a 16-week period of eating peanuts increased overall cerebral blood flow by 3.6% and boosted verbal memory performance by 5.8%. Investigators believe that multiple components working together—such as unsaturated fats, dietary fiber, vitamins, minerals, bioactive phytochemicals, plant-based protein, and L-arginine—contribute to these positive cognitive effects.

Sources: Science Daily, New York Post, Minute Mirror.