A normal blood glucose reading may seem nearly impossible to obtain but with the right amount of diet and exercise anyone can achieve one. A blood glucose test measures the amount of a certain type of sugar called glucose which is in your blood. Glucose almost always comes from starchy foods such as carbohydrates. Carbohydrates are the main source of energy that is used most often by the body. This is why most diabetics have to have routine diabetic screenings which will monitor their blood sugar readings after meals which will show what types of foods give them high amounts of glucose. Diabetes readings are key and essential in being able to control diabetes.