Normal range of sugar: High or low blood sugar can

High or low blood sugar can lead to complications, but these conditions are treatable. Learn what constitutes normal blood sugar and how it's tested. Stay on top of your health with a blood sugar levels chart by age. Discover normal ranges for 40, 50, and 70-year-olds to help manage your blood sugar and prevent complications. Recommended blood sugar levels can help you know if your blood sugar is in a "normal" range. See the charts in this article for type 1 and type 2 diabetes for adults and children. The normal fasting blood sugar range is 70-99 mg/dL. This baseline measurement, taken after an overnight fast, provides crucial insights into your body’s ability to regulate glucose, a key factor in overall health.