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Failure of Men to Select a Balanced Amino Acid Mixture¹

Department of Nutritional Sciences, University of California, Berkeley, California

Six healthy young men were given a choice between balanced and deficient amino acid mixtures containing 7 g N/day with a formula diet adequate in all other nutrients to see if they would select the balanced diet. For the 12 meals during which they were observed, the men demonstrated no ability to select the balanced mixture and actually chose the mixture deficient in methionine and phenylalanine somewhat more frequently. The study gave no indication that humans have the capacity to discriminate between amino acid mixtures on the basis of their ability to supply adequate quantities of indispensible amino acids.

² Reprint requests should be addressed to this author.

Manuscript received 31 March 1969.