Where do carbohydrates originate

Sugar, Milk, Grain (ex. Cereal, Bread)

Most carbohydrates come from foods of plant origin. The major simple carbohydrates or sugars are glucose, maltose, fructose, and sucrose which come from plants. Lactose is found in milk. We generally think of grains (Bread & Cereal group) as the only source of carbohydrates.