Daily Peanut Consumption May Influence Brain Health, New Research Finds

A study involving older adults suggests that eating unsalted, skin-roasted peanuts regularly may influence insulin responsiveness in specific regions of the brain.

Peanuts are widely consumed as an everyday snack, but researchers are increasingly examining whether they may have benefits beyond basic nutrition. A new study from researchers at Maastricht University Medical Center in the Netherlands has explored the possible relationship between regular peanut consumption and brain health in older adults.

Published in the scientific journal Food & Function in 2026, the research examined whether eating peanuts every day could influence the brain's response to insulin. The findings add to growing scientific interest in the relationship between nutrition, ageing and cognitive health.

How Was the Study Conducted?

The research involved 31 healthy older adults, with participants having an average age of approximately 67 years.

During the study, participants followed two separate 16-week periods. In one period, they consumed 60 grams of unsalted, skin-roasted peanuts every day. During the other period, they avoided peanuts. An eight-week interval separated the two periods.

Researchers used brain imaging techniques to examine regional changes in cerebral blood flow following the administration of insulin through the nose. This approach helped them investigate how different areas of the brain responded to insulin.

What Did Researchers Discover?

The findings indicated a change in insulin responsiveness in a specific region of the right side of the brain following the peanut-consumption period.

The affected region included areas associated with the hippocampus and parahippocampal gyrus, which play important roles in memory-related processes.

The researchers considered the findings relevant to understanding how dietary habits may influence brain metabolism during ageing.

However, the study did not establish that eating peanuts directly improves everyday memory or prevents conditions such as Alzheimer's disease or dementia. The findings relate specifically to measured brain insulin responsiveness.

What Earlier Research Says About Peanuts and Memory

The latest research follows an earlier study published in Clinical Nutrition in 2025, also involving 31 healthy older adults.

In that study, participants consumed 60 grams of unsalted, skin-roasted peanuts daily for 16 weeks. Researchers reported a 3.6% increase in global cerebral blood flow and a 5.8% improvement in delayed verbal memory performance during the peanut-consumption period compared with the control period.

These earlier findings and the 2026 research examine different aspects of brain function. While they provide interesting evidence for further investigation, they should not be combined to suggest that the latest study independently proved improvements in memory.

Why Is Brain Insulin Responsiveness Important?

Insulin is commonly associated with blood sugar regulation, but it also plays a role in the brain. It is involved in several processes related to metabolism, communication between brain cells and cognitive function.

Researchers are studying how changes in insulin signalling may be connected with the ageing brain.

The new peanut research offers another perspective on this subject. It suggests that everyday dietary choices may be worth investigating when studying brain metabolism and healthy ageing.

Are Peanuts a Healthy Everyday Food?

Peanuts contain protein, unsaturated fats, dietary fibre and several essential nutrients. For people who can safely consume them, they can be included as part of a balanced diet.

However, the study's use of 60 grams of peanuts per day should not be interpreted as a universal dietary recommendation. Individual nutritional requirements differ, and people with peanut allergies must avoid peanuts.

Consumers should also remember that a single small study cannot establish a treatment or prevention strategy for neurological conditions.

What Comes Next?

The findings provide a starting point for further research into the relationship between nutrition and brain health.

Larger studies involving more participants and longer follow-up periods will be necessary to determine whether changes in brain insulin responsiveness lead to meaningful long-term benefits.

For now, the research offers an interesting scientific observation: a common food such as peanuts may have a connection with processes taking place inside the ageing brain. More evidence will be needed before stronger health claims can be made.

Research Sources: Maastricht University Medical Center research published in Food & Function (2026); related research published in Clinical Nutrition (2025).

Editorial Note: This article reports scientific research and is not intended to provide individual medical or dietary advice.