The Study
Polyphenol intake and risk for dementia and cognitive decline in the elderly population of Greece: A principal component analysis approach.
This study looked at what people ate and then watched to see who got memory problems later. It found that people who ate more of certain veggies and beans tended to have slower memory loss, but it didn't make them eat those foods—it just noticed a pattern. So we can't say the veggies caused the better memory, just that they often went together.
Analysis score
Maximum 72 for a cohort study.
Where the score came from
Scientists looked at what older people ate and saw if it helped their brains stay sharp over three years.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 560 / 100
Quality score
Groups of people are followed over time to see who develops an outcome. Strong for identifying risk factors and associations, but cannot prove causation as firmly as RCTs.
Key takeaways
Summary
Based on the study abstract and findings.
- 1This means eating these foods might help keep your memory and thinking skills stronger as you get older, but it doesn't prove they prevent dementia.
- 2People who ate more cruciferous veggies, beans, and leafy greens (rich in lignans, flavonols, and isoflavonoids) had a 71% lower risk of dementia and their brains declined 0.9% slower per year than others.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
The Journal of nutrition
Year
2025
Authors
Stelios Chatzispyrellis, E. Fragopoulou, E. Mamalaki, E. Ntanasi, M. Maraki, S. Charisis, Ioannis Mourtzinos, M. Kosmidis, E. Dardiotis, Georgios M. Hadjigeorgiou, P. Sakka, Yian Gu, N. Scarmeas, M. Yannakoulia
Related Content
Claims (6)
People who eat diets high in polyphenols have better cognitive function and a lower incidence of cognitive decline with aging.
Elderly individuals aged 73 and older who consume a diet high in lignans, flavonols, and isoflavonoids from cruciferous vegetables, pulses, and leafy vegetables have a 71% lower incidence of dementia over three years compared to those who do not, after accounting for age, sex, education, physical activity, and chronic disease history.
Elderly individuals aged 73 and older who consume a diet higher in lignans, flavonols, and isoflavonoids show a 0.9% slower rate of cognitive decline per year compared to those with lower intake, as measured by standardized neuropsychological tests over three years.
In people aged 73 and older, a diet rich in lignans, flavonols, and isoflavonoids from cruciferous vegetables, pulses, and leafy greens accounts for 77.4% of polyphenol intake and is linked to lower dementia risk and slower cognitive decline over three years.
Among Greek adults aged 73 and older, different patterns of dietary polyphenol intake were not linked to changes in dementia risk or cognitive decline over three years.
People who consume a diet high in lignans, flavonols, and isoflavonoids have a lower incidence of dementia compared to those who do not, even after accounting for age, sex, education, lifestyle factors, and pre-existing health conditions.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.