Of course there's the problem with excess sugar from apple juice, but it's still an interesting study once again showing the possibilities of food as medicine.
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A growing body of evidence demonstrates that we can take steps to delay age-related cognitive decline, including in some cases that which accompanies Alzheimer's disease, according to a study published in the Journal of Alzheimer's Disease.
Thomas B. Shea, PhD, of the Center for Cellular Neurobiology; Neurodegeneration Research University of Massachusetts, Lowell and his research team have carried out a number of laboratory studies demonstrating that drinking apple juice helped mice perform better than normal in maze trials, and prevented the decline in performance that was otherwise observed as these mice aged.
In the most recent study Shea and his team demonstrated that mice receiving the human equivalent of 2 glasses of apple juice per day for 1 month produced less of a small protein fragment, called "beta-amyloid" that is responsible for forming the "senile plaques" that are commonly found in brains of individuals suffering from Alzheimer's disease.
http://www.sciencedaily.com/releases/2009/01/090122100826.htm