Blood sugar on the high end of the normal range may be linked to brain shrinkage in areas associated with memory and thinking. It’s not clear if blood sugar causes the problem, but having a high normal glucose level at age 60 or older can potentially serve as a useful marker of impending neurodegeneration. A fasting blood level of 100 to 125 mg/dL indicates “prediabetes” and increased risk for developing diabetes. A fasting level of 126 mg/dL or higher signifies diabetes.
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