Blood sugar, or glucose, is the main sugar found in your blood. It comes from the food you eat, and is your body’s main source of energy. Your blood carries glucose to all of your body’s cells to use for energy. High blood sugar is abnormally high blood glucose (blood sugar) in the blood. This is known to be the hallmark sign of a metabolic condition known as Diabetes. Read more An overview of Type 1 and Type 2 Diabetes