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CONFUSION, anger, loneliness and despair. These are just some of the feelings people express when they discover they have Alzheimer’s. But what if you knew twenty years beforehand that this was to be your fate?

That disturbing possibility has moved a step closer with a crucial advance in developing a blood test for Alzheimer’s. The test spots the chemical markers for the disease decades before you’d develop symptoms. And the test itself may even double up as a potential treatment.

Alzheimer’s is the most common form of dementia in older people, striking about 3 per cent of men and women over 65, and roughly 50 per…

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