- Carbohydrates are a class of nutrients that is a major source of energy for the body - Can also server as a glue that holds cells togehter - Classified as simple or complex - Plants are rich sources of carbohydrates There are 3 categories of carbs. # Sugars - A **monosaccharide** is a simple sugar that is the basic molecule of carbohydrates: - Glucose: Primary fuel for muscles, nerves, and other cells, the most common. - Fructose: In **fruits**, honey, and certain vegetables - Galactose: Component of lactose # Starches # Fiber