New guidelines for the diagnosis of Alzheimer's disease are to be released today by the National Institute on Aging and the Alzheimer's Association, reports The New York Times. The new definition breaks the disease down into three stages: when dementia has set in, when there are symptoms, but the person can still perform daily tasks, and when there are not yet symptoms, but changes are occurring in the person's brain. That early, symptom-free stage would be assessed through biomarkers.

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