 [ Symptoms ] what is the best thing for itching skin [ Disease ] 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 mgdl when fasting and less than 140 mgdl 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 mgdl in some 60 is normal in others 90 again anything less than 100 mgdl while fasting is considered normal by today is standards what is a low sugar level it varies widely too many people is sugar levels will not ever fall below 60 mgdl even with prolonged fasting when you diet or fast the liver keeps sugar levels normal by turning fat and muscle into sugar a few people is sugar levels may fall somewhat lower without taking diabetes medicine though or having uncommon medical problems it is difficult to drop sugar levels to an unsafe point to diagnose diabetes your doctor may do a fasting blood glucose test fasting blood glucose values low – less than 70mgdl normal   between 70 to 99mgdl pre diabetic – between 100 – 125mgdl diabetic – greater than 126mgdl non fasting blood glucose values low – less than 70mgdl normal   between 70 to 139mgdl pre diabetic – between 140 – 199mgdl diabetic – greater than 200mgdl the standard diagnosis of diabetes is made when at least two separate blood tests show that your blood sugar is elevated 80 to 120 normal fasting  under 120 is normal over 120 is high two hrs after food testing under 150 is normal over 150 is high 80 to 100