A diet that strategically combines elements of the traditional Mediterranean diet with an eating plan specifically designed to lower blood pressure may help slow some of the structural changes that occur naturally as the human brain ages, according to new research published online in the Journal of Neurology Neurosurgery & Psychiatry.
Greater adherence to this combined dietary pattern, known as the MIND diet, was linked to significantly less brain tissue loss over time. Researchers observed that the protective associations were particularly pronounced in grey matter, a critical component of the central nervous system that plays an instrumental role in memory formation, learning, decision-making, and general information processing. Furthermore, higher adherence to the diet was associated with less enlargement of the brain’s ventricles—the fluid-filled cavities that naturally tend to expand as surrounding brain tissue shrinks with age.
What Is the MIND Diet?
The Mediterranean-Dietary Approaches to Stop Hypertension Diet Intervention for Neurodegenerative Delay diet, widely abbreviated as the MIND diet, has previously been associated with better overall cognitive health, according to the researchers who conducted the new study.
The unique eating pattern places a strong dietary emphasis on green leafy vegetables, alongside a variety of other vegetables, berries, nuts, whole grains, fish, beans, olive oil, and poultry, while also allowing for moderate wine consumption. On the other side of the ledger, the plan explicitly recommends limiting the intake of butter, margarine, cheese, red meat, pastries, sweets, and fried fast foods.
Although previous scientific research has connected the MIND diet with various cognitive benefits, its precise relationship with age-related changes in physical brain structure has remained less clear until now. These structural shifts are of paramount clinical relevance because they are also deeply tied to the onset and progression of major neurodegenerative conditions, such as Alzheimer’s disease and Parkinson’s disease.
Researchers Tracked Brain Changes for Years
To thoroughly investigate the connection between the MIND diet and structural brain changes, researchers studied 1,647 middle-aged and older adults. Participants had an average age of 60 at the very start of the investigation and were drawn directly from the well-known Framingham Heart Study Offspring cohort, frequently referred to as the FOS.
Throughout the course of the investigation, participants underwent regular, comprehensive health evaluations every four to eight years. Starting in 1999, the study protocol was expanded to include regular MRI brain scans performed every two to six years to track physical alterations in brain morphology over time.
Dietary habits were meticulously assessed through at least one food frequency questionnaire completed by participants during routine check-ups conducted between 1991 and 1995, 1995 and 1998, and between 1998 and 2001. To ensure baseline consistency, every participant included in the final analysis had at least two brain MRI scan assessments performed between 1999 and 2019 and demonstrated no clinical evidence of stroke or dementia at the time of their very first MRI scan.
Across the study population, the average MIND diet score was just under seven out of a possible maximum score of 15, with 15 representing the strongest possible adherence to the dietary guidelines. When researchers analyzed the demographics of the participants, they found that individuals who landed in the highest third for MIND diet adherence were more likely to be women and to have achieved a college education. They were also notably less likely to smoke cigarettes or suffer from clinical obesity.
Additionally, individuals with higher diet scores were less likely to present with underlying medical conditions that are known to negatively affect long-term brain health, including type 2 diabetes, high blood pressure, and cardiovascular disease.
Higher MIND Scores Linked to Slower Grey Matter Loss
Over an average follow-up period of 12 years, serial MRI scans captured the expected age-related structural changes across the entire study group. These documented alterations included progressive decreases in total brain volume, grey matter volume, white matter volume, and hippocampal volumes.
At the exact same time, cerebrospinal fluid volumes and ventricular volumes increased steadily, alongside an accumulation of white matter hyperintensities—abnormalities that appear as bright spots on medical MRI scans and can indicate underlying tissue damage or microvascular disease.
Despite these ubiquitous trends, people who maintained higher MIND diet scores experienced a demonstrably slower loss of critical grey matter compared to those with lower scores.
For every three-point increase in a participant’s MIND diet score, researchers observed a slower grey matter loss equivalent to approximately 0.279 cubic centimeters per year. According to the study authors, that specific reduction corresponded to 20 percent less age-related decline and was statistically equivalent to roughly 2.5 years of delayed brain aging.
A remarkably similar protective pattern appeared when examining ventricular enlargement. Each three-point rise in the MIND diet score was associated with a slower expansion of total ventricular volume by minus 0.071 cubic centimeters per year. This shift was calculated to be equivalent to eight percent less tissue loss and about one full year of delayed brain aging overall.
Berries and Poultry Stand Out
When looking closely at the individual components of the eating plan, some specific foods appeared to contribute much more strongly to the favorable associations observed in the data.
Higher intake of berries, for instance, was directly linked to slower increases in ventricular volume over time. Similarly, poultry consumption was associated with slower ventricular enlargement, alongside a noticeably slower decline in precious grey matter.
In stark contrast, higher consumption of sweets was associated with faster ventricular enlargement and greater overall hippocampal atrophy. Furthermore, the regular intake of fried fast foods was linked to a larger decline in hippocampal volume, highlighting the detrimental impact of certain dietary choices on brain structures central to memory.
MIND-recommended foods that are exceptionally rich in antioxidants, such as berries, and high-quality protein sources like poultry may actively work to reduce oxidative stress and mitigate neuronal damage, the researchers suggested. Conversely, fried fast foods—which are frequently loaded with unhealthy fats, trans fats, and advanced glycation end-products—may contribute significantly to chronic inflammation and vascular damage within the central nervous system, they added.
Some Findings Were Unexpected
Despite the largely expected trends, not every individual food produced the anticipated pattern within the statistical models.
For example, a higher intake of whole grains was unexpectedly associated with several unfavorable structural changes, including faster rates of grey matter loss, accelerated loss of hippocampal volume, and faster ventricular enlargement.
Cheese, on the other hand, showed the exact opposite pattern to what conventional wisdom might suggest. Greater cheese intake was associated with slower declines in both grey matter and hippocampal volume, less ventricular enlargement, and even fewer white matter hyperintensities on the brain scans.
Benefits Appeared Stronger in Older Adults
The overall associations identified by the research team remained consistent across several additional sensitivity analyses and proved to be notably stronger among the older participants in the cohort.
The researchers noted that this particular finding may suggest the MIND diet could be especially relevant and impactful for individuals who are at a greater baseline risk of rapid brain aging or those who display higher degrees of variation in the pace of brain atrophy as they grow older.
Stronger associations were also consistently seen among participants who reported being more physically active, as well as among those who were not classified as overweight or obese.
That emerging pattern raises the distinct possibility that successfully combining a brain-healthy diet with other foundational healthy lifestyle habits could help compound the reduction in risk for neurodegenerative disease, according to the study authors.
The Study Cannot Prove Cause and Effect
Because the findings are derived from an observational study design, they cannot definitively establish that following the MIND diet directly caused the slower brain changes observed on the MRI scans.
The research team also pointed out several methodological limitations, noting that food frequency questionnaires rely heavily on participants accurately remembering and reporting what they ate over extended periods, which can naturally introduce recall bias into the data.
Additionally, the investigators were unable to entirely rule out the presence of mild cognitive impairment at the time of each participant’s first MRI scan, nor could they fully account for subtle changes in diet over time or the unmeasured influence of underlying genetic risk factors.
Furthermore, because the study participants were predominantly White, the researchers cautioned that the findings may not necessarily apply equally to individuals from other diverse ethnic and racial backgrounds.
Still, the researchers concluded that these findings reinforce the substantial potential of the MIND diet as a clinically viable, brain-healthy dietary pattern and strongly support its ongoing role in broader public health strategies aimed at slowing neurodegeneration in aging populations worldwide.
