Blueberries and memory have had a strong association for a while now. A six-year study of 16,010 elderly participants linked eating blueberries to delayed cognitive ageing by up to 2.5 years (1). And people who drank blueberry juice every day for 12 weeks saw significant improvements in brain function (2).
The antioxidants that blueberries are packed full of directly combat oxidative stress. Oxidative stress has been shown to effect intelligence and thus our memory. Blueberries are thought to contain the highest antioxidant capacity of our most commonly eaten foods (4, 5, 6). This is great for defending against free radicals and repairing DNA cellular damage.
DNA damage is part of the reason why we grow old and is a key reason for developing disease and cancers. Blueberries, however, help prevent this damage by neutralising free radicals. In one study, cell damage was reduced by 20% by participants drinking blueberry and apple juice every day for 4 weeks (7).