Referred to as the 'building blocks' of protein, amino acids are the smallest units which make up these large and complex molecules. The twenty-two naturally-occurring amino acids comprise twenty percent of normal body weight and almost three quarters of the body's dry (non-water, non-fat) weight. Essential amino acids are those which the body is incapable of manufacturing. These amino acids must be derived from foods in the diet. Nonessential amino acids are those which the body can synthesize itself as long as the proper raw materials, including essential amino acids, are available. Current research indicates that some of the nonessential amino acids actually may be 'semi-essential' or 'conditionally essential' under certain conditions. When the body is under stress, nonessential amino acids may be needed in greater quantities than can be produced from the essential ones. The eight essential amino acids are these: Isoleucine, Leucine, Lysine, Methionine, Phenylalanine, Theonine, Tryptophan and Valine. Histidine is essential for children and also during periods of rapid growth, and therefore is classified as semi-essential. Arginine is another semi-essential amino acid which under stressful conditions is needed in larger amounts than the body can manufacture
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