How Alzheimer’s disease can be avoided?

One of my biggest fears is that my mother might be struck by this disease. Both her mother and her grandmother were struck by Alzheimer’s disease, towards the end of their lives, so chances are really high for my mother as well. She’s still 55 though, but after a decade or so…

Anyway it really scares me, and I wish it won’t happen.
How Alzheimer’s disease can be avoided?
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