Higher blood-sugar levels, even those well short of diabetes, seem to raise the risk of developing dementia, a major new study finds. However, researchers also say that the findings suggests a novel way to try to prevent Alzheimer’s disease by keeping glucose at a healthy level.
“It’s a nice, clean pattern” — risk rises as blood sugar does, said Dallas Anderson, a scientist at the National Institute on Aging, the federal agency that paid for the study.
The new study, published in Thursday’s New England Journal of Medicine, just tracked people and did not test whether lowering someone’s blood sugar would help treat or prevent dementia. That would have to be tested in a new study, and people should not seek blood-sugar tests they wouldn’t normally get otherwise, Crane said.
The study involved 2,067 people 65 and older in the Group Health Cooperative, a Seattle-area health care system. At the start, 232 participants had diabetes; the rest did not. They each had at least five blood-sugar tests within a few years of starting the study and more after it was underway. Researchers averaged these levels over time to even out spikes and dips from testing at various times of day or before or after a meal.
Participants were given standard tests for thinking skills every two years and asked about smoking, exercise and other things that affect dementia risk.
After nearly seven years of follow-up, 524, or one quarter of them, had developed dementia — mostly Alzheimer’s disease. Among participants who started out without diabetes, those with higher glucose levels over the previous five years had an 18 percent greater risk of developing dementia than those with lower glucose levels.
Among participants with diabetes at the outset, those with higher blood sugar were 40 percent more likely to develop dementia than diabetics at the lower end of the glucose spectrum.
Alzheimer’s info: http://www.alzheimers.gov
Alzheimer’s Association: http://www.alz.org
Warning signs: http://www.alz.org/10signs