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Scientists Shed Light on Link Between Depression, Dementia
Date:7/30/2014

By
HealthDay Reporter

WEDNESDAY, July 30, 2014 (HealthDay News) -- Older people with depression are more likely to develop dementia, but researchers have been unable to explain the exact nature of the relationship between the two.

Specifically, they haven't been able to figure out the direction in which the relationship works -- does depression help bring on dementia, or does dementia cause people to become depressed?

A new study published online July 30 in the journal Neurology sheds more light on the mystery.

Depression is a risk factor for dementia, researchers report, and people with more symptoms of depression tend to suffer a more rapid decline in thinking and memory skills. While the study found an association between the two, it did not prove a cause-and-effect relationship.

Depression accounted for about 4.4 percent of the difference in mental decline that could not be attributed to dementia-related damage found in the brain, the researchers said.

"This is a risk factor we should take seriously," said lead author Robert Wilson, senior neuropsychologist at the Rush Alzheimer's Disease Center at Rush University. "Treating depression can reduce the risk of dementia in older people."

The study involved over 1,700 people, with an average age of 77, who had no thinking or memory problems at the start of the study.

Participants were screened every year for symptoms of depression, such as loneliness and lack of appetite, and took tests on their thinking and memory skills for an average of eight years.

During the study, about half of the participants developed mild problems with memory and thinking abilities that often appear as a precursor to Alzheimer's disease. A total of 315 people, or 18 percent, developed dementia.

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