High blood sugar linked to brain shrinkage

Published: December, 2012

What this means for preventing cognitive decline

If your blood sugar is on the high end of the normal range, diabetes may not be your only risk. A recent study in Neurology suggests you're also at risk of brain shrinkage in areas associated with memory and thinking. "I do think that this is a legitimate association. However, we don't know if blood sugar causes it," says Dr. Gad Marshall, a neurologist at Harvard-affiliated Brigham and Women's Hospital.

A normal fasting blood sugar level is 70 to 100 milligrams per deciliter (mg/dL). Fasting is defined as at least six hours without eating or drinking anything with calories. A fasting level of 100 to 125 mg/dL indicates you have "prediabetes" and are at increased risk for developing diabetes. A fasting level of 126 mg/dL and higher signifies that you probably have diabetes.

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