(5 mins) Transcript. Dr Greger's summary: "Cocoa and nitrite-rich vegetables, such as green leafies and beets, are put to the test for cognitive function."

(5 mins) Transcript. Dr Greger's summary: "The consumption of blueberries and strawberries is associated with delayed cognitive aging by as much as 2.5 years — thought to be because of brain-localizing anthocyanin phytonutrients, as shown on functional MRI scans."

(4 mins) Transcript. Dr Greger's summary: "Blueberries can significantly improve cognitive performance within hours of consumption."

(5 mins) Transcript. Summary by Dr Greger: "The consumption of blueberries and strawberries is associated with delayed cognitive aging by as much as 2.5 years — thought to be because of brain-localizing anthocyanin phytonutrients, as shown on functional MRI scans."

(1 min) Transcript. Dr Greger's summary: "Blueberries have been shown to improve cognition in rats — but what about in people?"