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Amino Acids: Disposal of NitrogenUnlike fats and carbohydrates, amino acids are not stored by the body, that is,no protein exists whose sole function is to maintain a supply of amino acidsfor future use. Therefore, amino acids must be obtained from the dietNITROGEN METABOLISMAmino acid catabolism is part of the larger process of whole body nitrogenmetabolism. Nitrogen enters the body in a variety of compounds present infood, the most important being amino acids contained in dietary protein.Nitrogen leaves the body as urea, ammonia, and other products derived fromamino acid metabolism. The role of body proteins in these transformationsinvolves two important concepts: the amino pool and protein turnover.