Researchers have found that administering the equivalent of five cups of coffee's worth of caffiene helped memory in a mouse model of demensia.

From the BBC News article:

Dr Gary Arendash, who led the latest study, told the BBC: "The results are particularly exciting in that a reversal of pre-existing memory impairment is more difficult to achieve.

"They provide evidence that caffeine could be a viable 'treatment' for established Alzheimer's disease and not simply a protective strategy.

"That's important because caffeine is a safe drug for most people, it easily enters the brain, and it appears to directly affect the disease process."

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Read the full article from BBC News here.