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There are four types of carbohydrates, named by the number of sugar molecules they contain.
- Simple saccharides with one or two sugar molecules
- Longer chain saccharides:
- Oligosaccharides (shortish chains), often linked to amino acids or lipids. They play a special role in cell membranes.
- Polysaccharides (long chains) are complex carbohydrates, with linear chains of sugars or branched clusters. Their function is either energy storage (starch, glycogen) or building structures (cellulose, chitin).
Nutrition and foods
Carbohydrates are the most common source of energy for the human body. Protein builds tissue and cells in the body. Carbohydrates are very good for energy, but, if a person eats more than needed, the extra is changed into fat.
If necessary, humans can live without eating carbohydrates because the human body can change proteins into carbohydrates. People of some cultures eat food with very little carbohydrates, but they still remain healthy.
Research in the United States and Canada have shown that people get about 40% to 60% of their energy from carbohydrates. However, studies suggest that some people get at least 55% to 75% of energy from carbohydrates. It may depend on the amount of physical work done by people: the harder the work, the more energy they need. The other need for energy is body temperature. Living in a cold climate means a person needs more energy.
- "The role of carbohydrates in maintenance of health". fao.org. 2013. http://www.fao.org/docrep/w8079e/w8079e08.htm. Retrieved May 29, 2013.