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People with the highest levels of flavonol intake tended to have higher levels of education and were more physically active.

Tomatoes, kale, apples and tea are loaded with quercetin, but no health benefit was registered for that flavonol.

Study members who followed a regimen with the highest flavonol levels—the top fifth—had a 48 percent lower risk of receiving an Alzheimer’s diagnosis than those in the bottom quintile.

Its benefits are attributed to its primary ingredient—cocoa—which is rich in an antioxidant called flavonol.

These animals had ingested one of the flavonol groups whose chemical structure seems to be too large to be absorbed by the small intestine.