A cocoa-based treatment would likely be very popular, but it's too soon to draw any conclusions about its effects.
"One drawback of this study is the lack of a control group for comparison, and we can't tell whether the results would have been different if the participants drank no cocoa at all."
But he added: "Poor vascular health is a known risk factor for dementia, and understanding more about the links between vascular problems and declining brain health could help the search for new treatments and preventions.".