Is Berries good for cognitive function?

The evidence points that way, though it's not yet conclusive. Most of the available literature for this topic centers on resveratrol, a polyphenol found in berries (and grapes), covering effects on health, skin, and bone density, including one randomized trial showing improved bone mineral density in postmenopausal women. That's reflected in an evidence score of 48/100 for its role in cognitive function, drawn from 4 studies (1 RCT), with an estimated impact on longevity rated limited (25/100).