Diurnal variations in plasma aminoacid concentrations. I) Effect of dietary protein intake on rhythm of neutral aminoacids
Ruggiero, M.; Perna, M.; Morelli, S.; Monaco, A.; Salvia, F.; Cantore, R.; Mangoni di S Stefano, C.
Bollettino della Societa Italiana di Biologia Sperimentale 57(21): 2116-2122
1981
ISSN/ISBN: 0037-8771 PMID: 7337732 Document Number: 172704
The effect of dietary protein content on the diurnal variations in plasma neutral amino acid levels was studied in normal human subjects. For 3 consecutive 5-day periods, subjects consumed diet containing 0, 75 or 150 g protein/day. Blood samples were drawn at 4-h intervals on the 4th and 5th days of each period. Consumption of the protein-free diet caused plasma concentrations of all amino acids in the late morning and afternoon, while the 150 g protein diet elicited increases in these levels during the daytime. Ingestion of the diet containing 75 g protein diminished the amplitude of the daily rhythms.