Blood sugar, or glucose, is the main sugar that your body makes from the food you eat. Glucose is carried through the blood to provide energy to your body's cells.
Diabetes is a disease in which your blood sugar levels are too high. Over time, having too much glucose in your blood can cause serious problems. Even if you don't have diabetes, sometimes you may have problems with blood sugar that is too low or too high. Keeping a regular schedule of eating, activity, and taking any medicines you need can help.
If you do have diabetes, it is very important to keep your blood sugar numbers in your target range. You need to check your blood sugar several times each day. Your health care provider will also do a blood test called an A1C. It checks your average blood sugar level over the past three months. If your blood sugar is too high, you may need to take medicines and/or follow a special diet.
Centers for Disease Control and Prevention