Boston, — Mediterranean Diet Linked to Lower Dementia Risk in Adults Over 50, Major Study Finds
A decade-long clinical study led by Massachusetts General Hospital has found that adults aged 50 and older who closely follow a Mediterranean-style diet have a significantly reduced risk—28% lower—of developing dementia.
The large-scale research project, one of the most comprehensive of its kind, tracked the health and dietary habits of more than 18,000 participants across the United States. The findings, published this week in the New England Journal of Medicine, provide compelling evidence linking long-term cognitive health to dietary choices centered on olive oil, fish, leafy greens, legumes, whole grains, and nuts.
“We’ve long known that diet plays a role in cardiovascular health, but this study strengthens the case that what we eat also profoundly impacts brain health,” said Dr. Naomi Feldstein, lead author and neurologist at Massachusetts General Hospital.
Participants who adhered most closely to the Mediterranean diet not only showed better cognitive performance over time but also had fewer biomarkers associated with neurodegeneration and inflammation. According to researchers, the diet’s emphasis on anti-inflammatory foods and healthy fats may protect blood vessels in the brain, thereby reducing age-related cognitive decline.
The study controlled for other risk factors such as physical activity, education level, and family history of dementia, underscoring the independent effect of diet on mental aging.
Dementia affects nearly 7 million Americans, a number expected to rise as the population ages. Experts say that while genetics and lifestyle both contribute to dementia risk, diet is one of the most modifiable factors.
“This research supports a growing body of evidence that lifestyle interventions, including dietary changes, can delay or even prevent the onset of cognitive impairment,” said Dr. Anjali Kapoor, a geriatric psychiatrist not affiliated with the study.
Public health officials are now encouraging greater adoption of Mediterranean-style eating patterns, not only for heart health but also for mental longevity. The study’s authors say further research is needed to explore how early dietary changes might influence dementia onset and whether similar results apply across different ethnic and socioeconomic groups.
“This isn’t a cure,” Dr. Feldstein emphasized. “But it’s a powerful tool we have today to protect our minds as we age.”
