PMID: 6538743May 1, 1984Paper

Diurnal variations in plasma concentrations of basic and neutral amino acids and in red cell concentrations of aspartate and glutamate: effects of dietary protein intake

The American Journal of Clinical Nutrition
T J MaherR J Wurtman

Abstract

The effects of dietary protein content on diurnal variations in plasma concentrations of neutral and basic amino acids, and on red blood cell levels of acidic amino acids, were studied in seven normal humans. The subjects consumed, on three consecutive 3-day periods, diets containing 0, 75, or 150 g of egg protein per day; blood was collected at 4-h intervals on the 2nd and 3rd days of each diet. For each of the large neutral amino acids (LNAA; isoleucine, leucine, tyrosine, phenylalanine, methionine, valine, and tryptophan) significant correlations were observed between its plasma levels and the protein content of the diet; highest levels were noted after consumption of the 150-g protein diet, and lowest values after the O-g protein diet. For each LNAA, except tryptophan, "fed" values (ie, those at 3 PM and 7 PM) were decreased relative to "fasting" values (those at 3 AM and 7 AM) after consumption of the O-g protein-free diet, but increased after consumption of the 150-g protein diet. Threonine, serine, and proline behaved like the LNAA: in contrast, glycine and alanine rose after protein-free meals and fell with the high-protein diet. The basic amino acids, lysine, arginine, and histidine tended to respond like the LNAA to v...Continue Reading

Citations

Jan 1, 1987·Annals of the New York Academy of Sciences·R J Wurtman
Nov 1, 1987·Environmental Health Perspectives·T J Maher, R J Wurtman
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