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Published on: August 8, 2013
by Elizabeth Lopatto for Bloomberg:
High levels of blood sugar raise the risk of dementia, even if a person doesn’t have diabetes, a condition known to be associated with the brain disease, a study found.
The higher the level of blood sugar among patients, the greater the risk of dementia, according to the report published in the New England Journal of Medicine. The finding was also true of diabetes patients.
Previous research has found that diabetes diagnosed later in life conveys a high risk of dementia. Insulin doesn’t work properly in the brains those with Alzheimer’s disease, the most common form of dementia, leading researchers to explore whether GlaxoSmithKline Plc’s diabetes drug Avandia may benefit those with the ailment. Clinical trials found the drug didn’t help.
“It’s a steadily increasing risk, the higher the blood glucose, the higher the risk, and that’s one of the things that surprised us,” Paul Crane, a study author and associate professor of medicine at the University of Washington in Seattle, said in a telephone interview.
It’s not clear why blood sugar is associated with dementia risk, Crane said. Higher levels of blood sugar may play a role in vascular disease or inflammation. Little research has been done on the effects of blood sugar within the normal range, he said.
The research published yesterday analyzed the medical records of about 2,100 people who were part of the Adult Change in Thought study. The study, begun in 1994, follows adults older than age 65. Participants are evaluated every two years by researchers.
In those without diabetes, people whose average blood glucose was 115 milligrams per deciliter had an 18 percent higher chance of dementia than peers with an average level of 100 milligrams per deciliter. Among diabetics, those with an average blood sugar level of 190 milligrams per deciliter were 40 percent more likely to be diagnosed with dementia than patients with averages of 160 milligrams per deciliter.
Although blood sugar varies, most people without diabetes have glucose levels of less than 125 milligrams per deciliter, according to the National Institutes of Health.
More than 5 million people in the U.S. have Alzheimer’s, a progressive disease that erodes a patient’s memory, thinking and ability to carry out simple tasks. The cause of the illness is unknown and there is no known cure.
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