Our body is, as is well known, cell-based entity. In order to keep alive and in functioning condition cells play an important part and they can function only when they are nourished and compensated by various food constituents, like carbohydrates, protein, fats, vitamins and minerals, for which various chemical processes take place, within out body, thus enabling it to receive energy. Energy is generated by various food constituents, as indicated above. Body uses and utilizes these food-stuffs as fuel which gets exhausted (or burnt) by oxygen and the resultant end product emerges as energy, heat, carbon dioxide and water. Energy is a motivating factor which helps the body to perform its various functions.
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