Urinary Excretion of Essential Amino Acids by Human Subjects Fed Diets Containing Proteins of Different Biological Value

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Abstract
The urinary excretion of “free” essential amino acids by male and female human subjects was determined when the diets contained no protein or small amounts of proteins of widely different biological value. No sex differences in amino acid excretion were detected. With the possible exceptions of histidine and threonine, the pattern of amino acid excretion was unchanged and the absolute amounts very little changed by adding various proteins to a protein-free diet. No correlation was found between the biological value of ingested protein and the total amount of essential amino acids excreted in the urine.