Carbohydrates are one of the four macromolecules of life- Lipids, Proteins, Nucleic Acids, and Carbohydrates. These molecules have simple forms called monomers and more complex forms called polymers. Starches are a polymer of carbohydrates or a complex form of carbohydrates. A monomer of carbohydrates is a monosaccharide or simple sugar. To make a polymer there needs to be more than one monomer together. An example is the monomer glucose. When you have two glucose molecules bonded together you get the polymer maltose. Monomers glucose and fructose bonded together makes polymer sucrose. These examples are disacchrides. Di- meaning two sacchrides- meaning sugar. Polysacchrides Poly- meaning many and sacchrides- meaning sugar. Starch is a polysacchride, so it has many monomers bonded together. Therefore a complex carbohydrate or a polymer of a carbohydrate.
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Starches are actually "complex carbohydrates", (foods that contain 3 or more linked sugars). Simle carbs are also called simple sugars, and are exactly that: like sugar on cereal, or candy. Simple sugars are digested very quickly---remember how cotton candy dissappears?...Other examples of simple carbs are fruits, and milk, which take a bit longer to digest, and therefore have more nutritional value...These kinds of Carbs, as well as complex carbs break down into sugar, which the body uses as fuel.
Examples of complex carbs (starches) are pasta, bread, oatmeal, rice, vegetables like broccoli, and beans, like chickpeas and kidney beans. Complex carbs take the longest to digest, and are therefore the best type of carb nutritionally.
Complex sugars have double or triple bonds.Whereas simple sugars have single bonds.