Glucose Glucose, sucrose and fructose are important carbohydrates, commonly referred to as simple sugars. They all provide the same amount of energy per gram, but are processed and used differently throughout the body Related Articles: Getting Started on a Plant-Based DietPrediabetesOur Diabetes NurseRetinopathy (Eye Damage)PODCASTSAlternative Meanings: GlucoseA “simple sugar” that is the main source of energy for the body. When consumed in food, it causes a quick increase in blood glucose.