Caffeine and Alzheimer's

New research from the US and Japan showed that giving the caffeine equivalent of five cups of coffee a day to aged mice with symptoms of Alzheimer's reversed two signs of the disease: it reversed memory impairment and reduced the hallmark protein in the animals' blood and brains.

Here's a link to the rest of the Article:
http://www.medicalnewstoday.com/articles/156452.php

I thought that this was interesting. My mother was an avid coffee drinker who drank about 8 cups of coffee a day and still suffered with Alzheimer's. She declined rather quickly too. She was diagnosed in 2000 and died in 2002. I'm wondering if she had Alzheimer's longer than what she did. She was certainly good at hiding it if that's the case.