Depression in middle age has previously been linked to an increased risk of dementia.
But this relationship appears to be driven by a small cluster of six specific symptoms, rather than by depression overall, new research in The Lancet Psychiatry suggests.
Focusing on these six symptoms might help people struggling with midlife depression avoid dementia later in life, researchers said.
"Dementia risk is linked to a handful of depressive symptoms rather than depression as a whole," said lead investigator Philipp Frank, a research fellow at University College London.
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