An average blood glucose reading of 105 to 120 mg/dL was associated with a 10% to 20% increased risk of dementia in older people without diabetes, according to a study in the New England Journal of Medicine. Researchers also found that among patients with diabetes, those with average glucose readings of 190 mg/dL had a 40% higher risk of dementia than those with readings of 160 mg/dL on average.

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