Diabetics have a significantly greater risk of dementia, both Alzheimer's disease the most common form of dementia and other dementia, reveals important new data from an ongoing study of twins. The risk of dementia is especially strong if the onset of diabetes occurs in middle age, according to the study.
"Our results . . . highlighted the need to maintain a healthy lifestyle during adulthood in order to reduce the risk of dementia late in life," explained Dr. Margaret Gatz, who directs the Study of Dementia in Swedish Twins.
In a study published in the January 2009 issue of Diabetes, Gatz and researchers from Sweden show that getting diabetes before the age of 65 corresponds to a 125 percent increased risk for Alzheimer's disease. Nearly 21 million people in the United States have diabetes, according to the American Diabetes Association, which publishes the journal.
This risk of Alzheimer's disease or other dementia was significant for mid-life diabetics as opposed to those who develop diabetes after 65 even when controlling for family factors. In other studies, genetic factors and childhood poverty have been shown to independently contribute to the risk of both diabetes and dementia.
"Twins provide naturally matched pairs, in which confounding factors such as genetics and childhood environment may be removed when comparisons are made between twins," explained Gatz, professor of psychology, gerontology and preventive medicine at the University of Southern California and foreign adjunct professor of medical epidemiology and biostatistics at the Karolinska Institute in Sweden.
Indeed, the chances of a diabetic developing Alzheimer's disease may be even greater in real life than in the study, the researchers write. They identify several factors that might have led them to underestimate the risk of dementia and Alzheimer's among those who develop diabetes before the age of 65.
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| Contact: Suzanne Wu suzanne.wu@usc.edu 213-740-0252 University of Southern California Source:Eurekalert |