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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.
Normal Blood Sugar Levels. Carbohydrates supply the body with blood glucose. This sugar in the bloodstream works in conjunction with insulin to supply the brain with food and the bodyâs cells with energy. In a healthy adult, normal blood sugar levels range from 70 mg/dl to 130 mg/dl, and up to 180 mg/dl after eating a meal. Causes At the metabolic level, hypoglycemia results from too little glucose in the blood or too much insulin.