Depression may raise risk of dementia, Alzheimer's, study says CNN

(CNN) -- The link between depression and dementia has always been unclear, but a new study supports the theory that depression increases dementia risk.

The findings, published in the journal Neurology, are based on nearly 1,000 people who were studied for up to 17 years. Researchers evaluated them for depression and dementia using standard clinical tests. Those who were depressed when first examined almost doubled their risk for dementia and also increased their risk for Alzheimer's disease.

Depression may raise risk of dementia, Alzheimer's, study says CNN

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