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A. At present, the diagnosis of diabetes or prediabetes is based in an arbitrary cut-off point for a normal blood sugar level. A normal sugar level is currently considered to be less than 100 mg/dL when fasting and less than 140 mg/dL two hours after eating. But in most healthy people, sugar levels are even lower. During the day, blood glucose levels tend to be at their lowest just before meals. For most people without diabetes, blood sugar levels before meals hover around 70 to 80 mg/dL. In some, 60 is normal; in others, 90.
Brain and Blood Sugar. The term blood sugar refers to the amount of glucose circulating in the blood. The blood sugar of a normal person is below 120 milligrams per deciliter one or two hours after eating a meal.When blood sugar levels are too low or too high, it is referred to as hypoglycemia or hyperglycemia, respectively.Hypoglycemia can lead to loss of energy for brain function. This is why low sugar levels are linked to poor attention and cognitive function.Hyperglycemia can be a result of diabetes, where blood sugar is too high but the sugar is not getting to the brain.rain and Blood Sugar. The term blood sugar refers to the amount of glucose circulating in the blood. The blood sugar of a normal person is below 120 milligrams per deciliter one or two hours after eating a meal.