Eating well, exercising and controlling weight all help to keep blood sugar in line.
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.
The effect of blood sugar on dementia risk was seen even when researchers took into account whether participants had the apoE4 gene, which raises the risk for Alzheimer’s.
At least for diabetics, the results suggest that good blood-sugar control is important for cognition, Crane said.
For those without diabetes, “it may be that with the brain, every additional bit of blood sugar that you have is associated with higher risk,” he said. “It changes how we think about thresholds, how we think about what is normal, what is abnormal.”