Dementia caused by Depression?

New evidence is pointing to depression as one cause of dementia. Not only depressed people in general, but also people who may just have episodes of depression here and there. Depression in certain people can be situational, which can easily be overlooked, and not treated. According to a study done by the University of Pittsburgh, just one depressive episode, untreated, during late middle-age, can double the risk of having dementia as a senior.