A sugar, starch, or cellulose that is a food source of energy for an animal or plant.
Any food rich in starch or other carbohydrates.
The unit structure of carbohydrates, of general formula CₙH₂ₙOₙ. Either the simple sugars or polymers such as starch and cellulose. The saccharides exist in either a ring or short chain conformation, and typically contain five or six carbon atoms.