What are carbohydrates?
Carbohydrates are composed of carbon, hydrogen, and oxygen in varying proportions; supply energy for work, play and other forms of vital activity and furnish fuel to maintain heat. Carbohydrates are either simple or complex and are the major source of energy in all human diets. They provide energy 4kcal/g.
The simple carbohydrates, glucose, and fructose are found in fruits, vegetables, and honey, sucrose in sugar and lactose in milk and glycogen in animal foods. The other complex carbohydrates, which are resistant to digestion in the human digestive tract, are cellulose in vegetables, fruits, and cereals, which constitute the dietary fiber component.