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Archive - 01 - 2009
January 27, 2009 (EurekAlert) - 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.Diabetes usually appears at a younger age than dementia does, the researchers note. Diabetes is also associated with a higher mortality rate, which may reduce the size of the sample of older adults. In addition, approximately 30 percent of older adults with diabetes have not been diagnosed.The results of the study implicate adult choices such as exercise, diet and smoking, as well as glycemic control in patients with diabetes, in affecting risk for Alzheimer's disease and diabetes, according to the researchers.The sample for the study was 13,693 Swedish twins aged 65 or older in 1998, the year tracking for dementia began. Information about diabetes came from prior surveys of twins and linkage to hospital discharge registry data beginning in the 1960s.
January 26, 2009 (ADA) - Higher average blood glucose (sugar) levels in people with type 2 diabetes are linked to lower cognitive functioning, according to a study published online today in the journal Diabetes Care.The ongoing Memory in Diabetes (MIND) study, a sub-study of the Action to Control Cardiovascular Risk in Diabetes (ACCORD) trial, found that higher levels of hemoglobin A1C levels (a measure of the average blood glucose levels over a 2-3 month period) are significantly associated with poorer performance on three cognitive tasks, which require memory, speed and the ability to manage multiple tasks at the same time. A higher A1C level was also associated with a lower score on a test of global cognitive functionPrevious studies have shown that people with diabetes are 1.5 times more likely to experience cognitive decline and dementia than people without diabetes. The MIND results suggest diabetes may be associated with mild cognitive impairment.Even a mild impairment in cognitive function is of concern for people with type 2 diabetes, said lead researcher Dr. Tali Cukierman-Yaffe, of the Gertner Institute for Epidemiology & Health Policy Research, Endocrinology Institute at Sheba Medical Center & Sackler School of Medicine at Tel-Aviv University in Israel. However, these results are cross-sectional so it is not yet known whether higher levels of blood sugar increase the risk for cognitive impairment or whether impairment decreases the ability to control blood sugar levels. This will be answered in the ongoing ACCORD-MIND study, in which study patients are followed over time and are tested three times during the trial. One aim of this ACCORD-MIND follow-up is to test the hypothesis that lowering A1C could result in improved cognitive function.
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