What is the normal range for blood sugar levels?

When glucose levels get higher than normal, they start to cause inflammation in blood vessels and nerves. This is where all the complications of diabetes come from. So you don't want high blood glucose levels. In people without diabetes, normal insulin function keeps sugars in a normal range. read more

This simple chart shows target blood sugar levels for adults before and after meals, after fasting, before exercise, and at bedtime, as well as an A1c target. read more

They vary throughout the day. (Click here for a blood sugar chart.) For someone without diabetes, a fasting blood sugar on awakening should be under 100 mg/dl. Before-meal normal sugars are 70–99 mg/dl. “Postprandial” sugars taken two hours after meals should be less than 140 mg/dl. read more

What we call fasting blood sugar or blood glucose levels is usually done six to eight hours after the last meal. So it's most commonly done before breakfast in the morning; and the normal range there is 70 to 100 milligrams per deciliter. read more

Normally, your pancreas releases insulin when your blood sugar, or “blood glucose,” gets high -- after a meal, for example. That signals your body to absorb glucose until levels get back to normal. But if you have diabetes, your body doesn’t make insulin (type 1 diabetes) or doesn’t respond to it normally (type 2 diabetes). read more

A normal fasting (no food for eight hours) blood sugar level is between 70 and 99 mg/dl (between 3.9 and 5.5 mmol/l). A normal blood sugar level two hours after eating is less than 140 mg/dl (7.7 mmol/l). read more

A normal blood sugar range for an adult is less than 100 milligrams per deciliter when fasting for a minimum of 8 hours, or 140 mg/dL after eating, according to WebMD. Sugar levels are usually their lowest right before mealtime when nondiabetics' sugar levels are generally around 70 to 80 mg/dL. read more