Whatsoever organic material present in a living system are mainly classified under carbohydrates, proteins and lipids. All these three play a vital role not only in the structure but also in the functionality of body. The literal meaning of carbohydrate is hydrate of carbons. Carbohydrates are compounds of carbon, hydrogen and oxygen represented by empirical formula Cn (H,O),. As per the definition, carbohydrates are "polyhydroxy (more than one OH group) aldehyde or polyhydroxy ketone". Our body has been designed and developed to solve the basic survival problems such as energy to do its work, materials to build and maintain its form and agents to control these processes efficiently. Key nutrients of the food we eat provide solution to these life-sustaining problems. Our body's primary fuel is carbohydrate, which provides energy. Energy is a primary necessity of life. (Energy is the capacity of an organism by which he can do work.)
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