A multitude of studies, some dating back to the late 1990s, have suggested a link between diabetes and Alzheimer's disease, as well as other types of dementia. However, those studies had some inconsistencies in the definition of both diabetes and dementia, thus making the results less convincing than they could be.
According to an article on Yahoo.net:
"The authors of the new study, led by Yutaka Kiyohara, MD, an environmental medicine researcher at Kyushu University, in Fukuoka, sought to address this weakness by using the gold standard of diabetes diagnosis, an oral glucose tolerance test."
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