Study Links Healthy Plant-Based Diets to Lower Dementia Risk in Adults Over 50

A study published in Neurology analyzed dietary patterns and health outcomes among 92,849 adults with an average age of 59. Researchers tracked participants for 11 years, during which 21,478 developed Alzheimer's disease or another form of dementia.

The study focused on plant-based diets, distinguishing between overall plant food consumption, healthy versions rich in whole foods, and unhealthy versions high in refined and processed products.

Participants consuming the highest amounts of plant foods had a 12% lower risk of dementia compared to those consuming the least. When accounting for diet quality, those following the healthiest plant-based diets showed a 7% lower risk, while those with the unhealthiest plant-based diets had a 6% higher risk.

The findings indicate an association, not causation, and highlight the importance of diet quality in potential dementia prevention.

“Plant-based diets have been shown to reduce the risk of conditions like diabetes and high blood pressure, but less is known about dementia," said study author Song-Yi Park of the University of Hawaii.”

a subgroup of 45,065 participants tracked over 10 years, 8,360 developed dementia.

Those whose diets shifted toward more unhealthy plant-based foods had a 25% higher risk of dementia, while those who improved their diets experienced an 11% lower risk. Adopting a healthier plant-based diet after age 60 was associated with reduced dementia risk in this group. The study relied on self-reported food questionnaires, which may introduce inaccuracies due to recall issues.

However, the large sample size and extended follow-up period support the reliability of the associations observed. Results align with prior research on diets like the Mediterranean or MIND patterns, which emphasize whole, minimally processed foods and link to improved cognitive health.

affects millions worldwide, with Alzheimer's being the most common form.

Risk factors include age, genetics, and lifestyle elements such as diet, physical activity, and education. While the study suggests dietary interventions may help, experts note that observational data cannot prove diet alone prevents dementia; other lifestyle factors likely contribute. The research provides context for public health efforts aimed at cognitive aging.

Affected populations include older adults, with potential implications for dietary guidelines in aging societies. Future studies could explore causal mechanisms through randomized trials to confirm these associations.