Eating Peanuts Every Day May Benefit Your Aging Brain
Eating peanuts every day may do more than provide protein and healthy fats. New research suggests that they could also support how the aging brain responds to insulin. This is important because insulin helps brain cells communicate and supports memory. As people grow older, the brain may become less responsive to this hormone.
A study from Maastricht University Medical Center in the Netherlands found that eating unsalted, skin-roasted peanuts for 16 weeks changed insulin responsiveness in brain regions linked to memory. The findings, published in Food & Function in October 2026, offer a possible explanation for earlier research linking peanuts to better memory in older adults.
However, the results do not mean peanuts can prevent Alzheimer's disease or reverse memory loss. The study was small, and researchers still need to confirm the findings in larger groups.
What happens to your brain when you eat peanuts every day?
Insulin is best known for helping the body control blood sugar. However, it also works in the brain, where it supports nerve cells and helps them communicate.
These functions matter for learning and memory. As people age, some brain regions may respond less effectively to insulin. Researchers believe this change may be linked to age-related problems with memory and thinking.
The new study suggests that regular peanut consumption may improve how certain memory-related brain regions respond to insulin.
For example, an older adult who sometimes struggles to remember names or recent conversations may wonder whether diet can support brain health. This research offers an interesting possibility, but it does not show that eating peanuts will prevent those memory problems.
What the new peanut study found
Researchers studied 31 healthy adults aged 60 to 75. Participants ate 60 grams of unsalted, skin-roasted peanuts daily for 16 weeks. This is about two servings a day.
They later completed a control period without peanuts. The researchers compared the results from both periods.
Using brain scans, the team examined how different brain regions responded after insulin was given through the nose. They found changes in insulin responsiveness in parts of the right side of the brain.
These areas included the hippocampus, parahippocampal gyrus, lingual gyrus, and posterior cingulate gyrus. Several of these regions play roles in memory and other thinking skills.
The findings suggest that peanuts may help support brain insulin function. However, the researchers did not show that participants became better at remembering things during this particular study.
The research was published in the peer-reviewed journal Food & Function. The study was supported by The Peanut Institute Foundation, which reported that it had no role in designing the research, analyzing the results, or preparing the paper.
Peanuts may also improve blood flow and memory.
The new findings build on an earlier study published in Clinical Nutrition in 2025. It involved the same group of 31 older adults and used a similar 16-week peanut eating plan.
Researchers found that overall blood flow to the brain increased by 3.6%. Blood flow in the brain's gray matter increased by 4.5%.
Participants also improved their scores on one verbal memory test by 5.8%. This test measured how well they remembered words after a delay.
However, peanuts did not improve every area of thinking. Researchers found no clear benefits in tests of executive function or processing speed.
These results are promising, but the small number of participants limits how widely they can be applied.
Why might peanuts support brain health?
Peanuts contain several nutrients that may support the brain and blood vessels.
Healthy fats: Peanuts contain unsaturated fats that can support heart and blood vessel health.
Protein: They provide plant-based protein, which helps the body maintain and repair tissues.
Fiber: Fiber supports digestion and can help with blood sugar control. For more ways to increase your intake, read For More Fiber, Don’t Scrap Those Fruit and Vegetable Peels.
L-arginine: This amino acid helps the body make nitric oxide, a substance that helps blood vessels relax and widen.
Peanuts also contain vitamins, minerals, and plant compounds with antioxidant effects. Researchers believe several of these nutrients may work together rather than one nutrient explaining all the possible benefits.
How many peanuts should you eat?
The study used 60 grams of unsalted, skin-roasted peanuts daily. Participants could eat them in one sitting or divide them between meals.
For example, someone could add a portion to breakfast and another to an afternoon snack. They could also mix peanuts into porridge or eat them alongside fruit.
However, 60 grams is a fairly large portion and contains a substantial amount of calories. People do not need to copy the study's exact amount to enjoy peanuts as part of a balanced diet.
Choose plain or unsalted varieties when possible. Also, remember that peanuts are not a treatment for diabetes or other health conditions. People managing blood sugar can read How Decision Fatigue Affects Diabetes Management (and What to Do About It) for more practical advice about daily health choices.
Risks and safety considerations
Peanuts are nutritious, but they are not suitable for everyone.
People with peanut allergies should avoid them. An allergic reaction can cause itching, swelling, breathing problems, and, in severe cases, life-threatening anaphylaxis.
Peanuts can also add many calories to a meal when eaten in large amounts. People managing their weight may find it helpful to watch portion sizes. Our article on New Weight Loss Drug Retatrutide Provides Double the Weight Loss of Ozempic explores another area of weight and metabolic health research.
People with medical conditions or special dietary needs should speak with a healthcare professional about suitable food choices.
Bottom line
Eating peanuts may support brain health in older adults by improving blood flow and changing how certain brain regions respond to insulin. Earlier research also found a small improvement in verbal memory.
However, these studies involved only 31 people. They do not prove that peanuts prevent Alzheimer's disease or protect everyone from age-related memory loss.
Peanuts can still be part of a healthy diet. Enjoy them in sensible portions, but do not treat them as a replacement for medical care or other healthy habits.
Frequently Asked Questions
Can eating peanuts every day improve memory?
Small studies in older adults found improved verbal memory scores after 16 weeks of daily peanut consumption. More research is needed to confirm the benefit.
How many peanuts did participants eat in the study?
Participants ate 60 grams of unsalted, skin-roasted peanuts daily for 16 weeks. This was about two servings.
Can peanuts prevent Alzheimer's disease?
There is no strong evidence that eating peanuts prevents Alzheimer's disease. The research examined brain function, not whether participants developed or avoided dementia.
Are salted peanuts good for brain health?
The study used unsalted, skin-roasted peanuts. It did not compare salted and unsalted varieties, so researchers cannot say whether one provides greater brain benefits.
