Abstract

Six healthy male volunteers, aged 21 to 31 years, participated in an 81-day study of the effect of dietary nitrogen level and the pattern of dietary amino acids on serum amino acids. Ten different formula diets were consumed, nitrogen being supplied from mixtures of synthetic l-amino acids. Results indicated that although serum amino acids are altered within 3 days after a change in diet, they do not reflect the particular amino acid pattern consumed. Variations in levels of serum amino acids were evident when the total amount of dietary nitrogen was shifted. When dietary nitrogen was lower, there were increases in nonessential amino acids, especially alanine, and decreases in essential amino acids, mainly those with branched chains.

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