Simple carbohydrates. Simple sugars are the most basic type of carbohydrates. A carbohydrate is a substance that have a single sugar molecule or multiple sugar molecules in various forms. Simple carbohydrates include natural sugars such as lactose and fructose, as well as added sugars.
Source: An Invitation To Health 9th edition, Dianne Hales, Ch.5-Nutrition, page 107.
