Compounds of oxygen, hydrogen, and carbon formed into the sugars, starches, and cellulose formed by plant photosynthesis of water and carbon dioxide. They provide energy and facilitate fat production. Three primary types: monosaccharides (simple sugars like fructose and glucose), disaccharides (lactose, maltose, and sucrose), and polysaccharides (cellulose, glycogen, dextrin, starch). Foods that provide carbohydrates include breads, beans, dairy products, potatoes, corn, many sweet deserts.