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The Urinary Excretion of Five Essential Amino Acids by Young Women^{1, 2,}

Nebraska Agricultural Experiment Station, University of Nebraska, Lincoln

Data have been presented for the urinary excretion of threonine, valine, tryptophan, leucine, phenylalanine, and tyrosine by young women who were subjects for studies of the requirements of the 5 essential amino acids mentioned. Several different levels of each amino acid in crystalline from were fed to each subject.

There was considerable variation in the excretion of all of the amino acids studied among individuals at the same and at different levels of intake. The highest mean excretion occurred on the highest intake for the amino acids threonine, tryptophan, and phenylalanine, and the lowest excretion occurred on the lowest intakes for tryptophan, phenylalanine, and leucine. Differences between mean excretion values on different intakes were seldom significant.

² Supported in part by a U. S. Department of Agriculture contract sponsored by the Human Nutrition Research Division, Agricultural Research Service.

³ Present address: Institute of Home Economics, U. S. Department of Agriculture, Washington, D.C.

⁴ Present address: Department of Home Economics, Louisiana State University, Baton Rouge.

Manuscript received 11 July 1958.