Dementia is more common among people who become depressed in middle age or later in life than among those who aren't depressed, according to a report in Archives of Psychiatry. In that study, age of onset was also linked to the type of dementia—individuals with late-life depression had double the risk for developing Alzheimer's disease, while those whose depression began in midlife faced three times the risk for vascular dementia (which is caused by poor blood flow in the brain).
Depression is often overlooked in older adults. "I think older individuals are more in denial about having depressive illness," says Dr. M. Cornelia Cremens, assistant professor of psychiatry at Harvard Medical School and a geriatric psychiatrist in the senior health practice at Massachusetts General Hospital. "They'll say, ‘Well, I'm 83 years old—who wouldn't be depressed?‘" Ignoring sadness or dismissing it as a normal side effect of aging could allow potentially treatable memory issues to progress unchecked.
"If somebody appears to have the beginning of dementia and they are depressed, it's very important to treat their depression, and to treat it as aggressively as possible," Dr. Cremens says.
Although there aren't proven methods for preventing dementia, strategies such as treating depression and following healthy lifestyle habits, including exercising, eating a healthy diet, and keeping the mind active with social outings and games, may help.
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