A "super fruit" famed for its health-giving properties may protect ageing brains and help prevent Alzheimer's, new research suggests. Blueberries, given in the form of a powder, were found to improve the thinking performance of 47 adults aged 68 and older who already had mild cognitive impairment, a risk factor for Alzheimer's. A similar effect was not seen when volunteers were treated with a "dummy" placebo powder that was inactive.

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