MIND Diet Linked to Brain Health in Older Adults
Recent research published in JAMA Network Open suggests that older adults who adhere to the MIND diet, a Mediterranean-style eating pattern, may be less likely to show signs of brain degenerative conditions associated with memory loss and dementia. This study examined dietary habits alongside brain autopsy results, hinting that nutrition might play a role in protecting memory-related areas of the brain as people age.
The MIND diet combines elements from both the Mediterranean diet, focusing on fruits, vegetables, fish, and olive oil, and the DASH diet, which promotes lower sodium and balanced nutrients to combat high blood pressure. This diet emphasizes foods believed to support brain health, like leafy greens, berries, nuts, and fish, while limiting those high in saturated fat and sugar, such as red meat and pastries.
While earlier studies indicated a link between the MIND diet and slower cognitive decline, reduced Alzheimer’s disease risk, and greater brain volume, its connection to specific brain pathologies hadn’t been thoroughly examined. The current study sought to fill that gap, particularly focusing on hippocampal sclerosis, a degenerative condition affecting the brain’s memory center.
Study author Puja Agarwal, an assistant professor at Rush University Medical Center, pointed out that with limited treatments available for dementia, understanding how diet may influence cognitive health is vital. Previous research has linked the MIND diet to slower cognitive decline and reduced dementia risk, but this study aimed to explore other possible mechanisms linking diet and brain health.
The research team utilized data from the Memory and Aging Project, a long-term study at Rush University in Chicago. Participants, who initially did not have dementia and agreed to donate their brains posthumously, underwent cognitive tests, physical exams, and dietary assessments over several years.
For the dietary analysis, participants completed thorough food frequency questionnaires about their usual diets. The researchers calculated individual MIND diet scores based on 15 components, which included both beneficial and less beneficial foods for brain health.
During brain autopsies, researchers looked at the hippocampus for signs of sclerosis and assessed neuronal loss, while also considering other factors such as Alzheimer’s markers and genetic risks. Among the 809 participants, roughly 10 percent showed signs of hippocampal sclerosis. Notably, those with higher MIND diet scores were less likely to have this condition, even after adjusting for various factors. Each additional point on the MIND diet score was associated with a 22 percent reduction in the odds of developing hippocampal sclerosis.
“These results suggest that diet may be an important modifiable risk factor for enhancing hippocampal health,” Agarwal noted.
The researchers also examined cases where hippocampal sclerosis accompanied LATE pathology. Again, participants who more closely followed the MIND diet showed lower odds of having both conditions, although the diet didn’t seem to be significantly associated with LATE pathology on its own.
Further analysis of a subset of 300 participants showed that adherence to the MIND diet correlated with fewer signs of severe neuronal loss, maintaining significance even when accounting for Alzheimer’s and vascular issues.
A mediation analysis revealed that approximately 21 percent of the protective effect of the diet against dementia could be linked to its association with lower rates of hippocampal sclerosis.
“Our findings enhance existing literature on the MIND diet and brain health outcomes, showing how diet may support hippocampal health by reducing sclerosis and promoting neuronal presence,” Agarwal commented, adding that this is the first evidence in human studies linking diet and dementia through hippocampal sclerosis.
Despite robust findings, the study has limitations, such as its observational nature, which precludes establishing causation. Unmeasured factors like healthcare access or genetic variability might also influence the relationship between diet and brain health.
The participant demographic, primarily older White adults, may also restrict how broadly these findings can be generalized. Future research aims to explore whether these trends hold in diverse populations or younger age groups, and what specific nutrients or foods may be most beneficial.
“The increasing focus on modifiable lifestyle factors like diet is crucial for dementia prevention globally,” Agarwal remarked. “Our ongoing research will explore specific foods and nutrition interactions with neuroinflammation and oxidative stress, which are prominent in Alzheimer’s disease.”
The study, titled “MIND Diet and Hippocampal Sclerosis Among Community-Based Older Adults,” was conducted by a team of researchers, including Agarwal and several colleagues.
