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Carbohydrates. The carbohydrates are the compounds which provide energy to living cells. They are compounds of carbon, hydrogen and oxygen with a ratio of two hydrogens for every oxygen atom. The carbohydrates we use as foods have their origin in the photosynthesis of plants.They take the form of sugars, starches, and cellulose.oth starches and cellulose are carbohydrates which are classified as polysaccharides since they are composed of chains of glucose molecules. While they are similar, starches can be used as energy sources by the human body while cellulose cannot.
Last updated: May 29, 2002. Carbohydrates are used as energy by the body; they fuel our workouts, as well as providing ample fuel to be used throughout the course of the day. Use the following calculator to determine how many carbs you should be taking in each day. Carbohydrates are used as energy by the body.