Depression Appears To Be A Cause Of Dementia (really?)

From BBC news:

Having depression may nearly double the risk of developing dementia later in life, new research suggests…

It showed that the more times someone experienced depression, the higher their dementia risk was.

Having two or more episodes of depression nearly doubled the risk of dementia…

“It is well known depression is common in early stages of dementia. What this study demonstrates is that depression at a younger age is probably a significant risk factor for dementia,” he said.

I don’t have the actual study being cited above, but I have some questions, nonetheless. Grace Jackson MD wrote a book on the destructive nature of psychopharmaceuticals entitled: Drug-Induced Dementia: a perfect crime. I have a synopsis of the book on the blog here.

This is an excerpt from the publisher:

In the face of this imminent crisis, concerned observers have called for policies and practices which aim to prevent, limit, or reverse dementia. Drug-Induced Dementia: A Perfect Crime is a timely resource which reveals why and how medical treatments themselves – specifically, psychopharmaceuticals – are a substantial cause of brain degeneration and premature death.

A first-of-its-kind resource for patients and clinicians, the book integrates research findings from epidemiology (observational studies of patients in the “real world”), basic biology (animal experiments), and clinical science (neuroimaging and autopsy studies) in order to demonstrate the dementing and deadly effects of psychiatric drugs.

So I need to ask about the above story that is floating all over the internet right now: is it depression that causes dementia or is it the aggressive pharmacological treatment of depression that this country has shifted to in the last 30 years?