From a Rush University Medical Center online article:

The study found that participants in the group with the highest flavonol consumption were 48% less likely to develop Alzheimer’s dementia later on in life than participants with the lowest level. Of the 186 people in the highest group, 28 people, or 15%, developed Alzheimer’s dementia, compared to 54 people, or 30%, of the 182 people in the lowest group.

People who eat or drink more foods with flavonol, which is found in nearly all fruits and vegetables, plus tea and wine, may be less likely to develop Alzheimer’s dementia, according to the Rush researchers. They published the results of their study in the Jan. 29 online issue of Neurology.

Flavonols are a type of flavonoid, a group of phytochemicals found in plant pigments. They are known for their beneficial effects on health due to their antioxidant and anti-inflammatory properties.

A total of 921 people with an average age of 81 participated in the Neurology study. These participants did not have Alzheimer’s dementia when starting the study.

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