If feeding your children healthy snacks is high on your priority list, it’s time to start reading those labels – and if you haven’t been introduced to glucose, fructose, and the mixture of the two, you’ll definitely want to familiarize yourself. Glucose and fructose are both carbohydrates and simple sugars, AKA monosaccharides, which are found in most foods. They also happen to be the chief source of energy for the human body.