A new study suggests that what we eat every day may play an important role in how our brains age. Researchers have found that a diet that combines elements of the Mediterranean diet and a blood pressure–lowering diet may help slow down changes in the brain that are linked to aging and diseases like Alzheimer’s.
The study was published in the Journal of Neurology, Neurosurgery & Psychiatry. It focuses on a diet known as the MIND diet, which stands for Mediterranean–Dietary Approaches to Stop Hypertension Intervention for Neurodegenerative Delay.
This diet has already been linked to better memory and thinking skills in past research, but scientists wanted to understand whether it could also affect the physical structure of the brain.
As people age, the brain naturally changes. Brain tissue can shrink over time, especially in areas like gray matter, which is important for thinking, memory, and decision-making.
At the same time, fluid-filled spaces in the brain, called ventricles, can grow larger. These changes are often seen in people with neurodegenerative diseases such as Alzheimer’s and Parkinson’s disease.
To study this, researchers followed 1,647 adults from the long-running Framingham Heart Study. These participants were around 60 years old when the study began. They were tracked for many years, with regular health check-ups and brain scans over a period of up to two decades.
Participants also completed detailed food questionnaires over several years. These questionnaires helped researchers understand how closely each person followed the MIND diet.
The diet encourages eating foods such as green leafy vegetables, berries, nuts, whole grains, fish, beans, olive oil, and poultry. It also suggests limiting foods like red meat, butter, cheese, sweets, and fried fast foods.
When researchers looked at brain scans over time, they found that all participants showed some signs of brain aging. However, those who followed the MIND diet more closely had slower changes in their brain structure.
In particular, people with higher MIND diet scores showed slower loss of gray matter. For every small increase in how closely they followed the diet, their brain aging appeared to slow down. The researchers estimated that this could be equal to delaying brain aging by about two and a half years.
They also found that people who followed the diet more closely had slower growth of the brain’s ventricles. This suggests less overall brain shrinkage. In simple terms, their brains stayed healthier for longer.
Certain foods seemed to play an important role. Eating more berries was linked to slower changes in brain structure, especially in the ventricles. Poultry was also linked to better brain outcomes, including slower loss of gray matter.
On the other hand, eating more sweets and fried fast foods was linked to worse brain changes. These foods were associated with faster brain shrinkage and more damage in areas important for memory.
Interestingly, the study also found some unexpected results. Higher intake of whole grains was linked to faster brain changes, while higher cheese intake was linked to slower brain decline. These findings were surprising and not fully understood, showing that more research is needed to explain these effects.
The benefits of the MIND diet were stronger in older adults and in people who were physically active and not overweight. This suggests that combining a healthy diet with other healthy habits may provide the greatest protection for the brain.
It is important to note that this study does not prove that the diet directly causes these benefits. It is an observational study, which means it shows a connection but cannot confirm cause and effect.
The researchers also relied on people remembering and reporting their food intake, which may not always be accurate. In addition, most participants were white, so the results may not apply to all populations.
Even with these limitations, the findings are important. They suggest that diet may be a simple and practical way to help protect the brain as people age. Since there is currently no cure for many neurodegenerative diseases, prevention is a key focus for scientists and doctors.
Overall, this study supports the idea that healthy eating habits can have long-term benefits beyond just physical health. It shows that the MIND diet may help slow down brain aging and reduce the risk of serious conditions later in life.
If you care about dementia, please read studies about low choline intake linked to higher dementia risk, and how eating nuts can affect your cognitive ability.
For more information about brain health, please see recent studies that blueberry supplements may prevent cognitive decline, and results showing higher magnesium intake could help benefit brain health.
The research findings can be found in the Journal of Neurology, Neurosurgery & Psychiatry.
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