Normal Fasting Blood Sugar:
A normal fasting blood sugar (which is also the blood sugar a normal person will see right before a meal) is:
83 mg/dl (4.6 mmol/L) or less.
Many normal people have fasting blood sugars in the mid and high 70 mg/dl (3.9 mmol/L) range.
Though most doctors will tell you any fasting blood sugar under 100 mg/dl (5.6 mmol/L) is "normal", there are several studies that suggest that testing with a fasting blood sugar in the mid 90 mg/dl (5 mmol/L) range often predicts diabetes that is diagnosed a decade later.
Post-Meal Blood Sugar (Postprandial)
Independent of what they eat, the blood sugar of a truly normal person is:
Under 120 mg/dl (6.6 mmol/L) one or two hours after a meal.
Most normal people are under 100 mg/dl (5.5 mmol/L) two hours after eating.
A truly normal A1c is between 4.6% and 5.4%
A1cs are not as good a measure of actual blood sugar control in individuals as they are for groups. An A1c of 5.1% maps to an average blood sugar of 100 mg/dl (5.6 mmol/L) or less when group statistics are analyzed, but normal variations in how our red blood cells work make the A1cs of truly normal individuals fall into a wider range.
Some people's A1cs are always a bit higher than their measured blood sugars would predict. Some are always lower. NOTE: If you are anemic your A1c will read much lower than your actual blood sugars and the resulting A1c is not a useful gauge of your actual blood sugar control.
Heart attack risk rises in a straight line fashion as A1c rises from 4.6%.
How Blood Sugar Control Works—And How It Stops Working:
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