Carbohydrates include foods composed of starches, sugar and/or fiber. They are the most common source of energy found in food. Most carbohydrates break down into glucose (a specific type of sugar).
Examples of carbohydrates are: table sugar, fruit, milk, grains and vegetables.
Proteins and fats make up the other two main sources of energy. They do not break down into glucose.
"Carbohydrates." Harvard School of Public Health Nutrition Source. 2006. Harvard School of Public Health. 29 Nov 2006