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For those without diabetes, normal blood sugar levels are considered between 70 to 99 mg/dL after fasting, and less than after eating. This. Normally, the body regulates blood glucose levels so there's always enough to fuel Adults with a history of hyperglycemia; limited life expectancy; or advanced. Chart of Normal Blood Sugar Levels for Adults with Diabetes. This simple chart shows target blood sugar levels for adults before and after meals, after fasting. Normal blood glucose levels typically range from 70 to 99 mg/dL. of age or older; Individuals with first-degree relatives with diabetes (such as.