Learning in Monkeys Fed Elevated Amino Acid Diets

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Abstract
Diets containing altered levels of specific amino acids or their metabolites were fed to rhesus macaques during infancy and during fetal life. Learning tests, after the animals were placed on a normal diet, indicated permanent mental retardation in monkeys that received phenylalanine either prenatally or for 3, 6, or 12 months postnatally, and also in monkeys fed parachlorophenylalanine, which inhibits the metabolism of phenylalanine. Retardation was not detected in monkeys fed diets high in other amino acids or in pair-fed control animals.

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