Ruggiero M, Perna M, Morelli S, Monaco A, Salvia F, Cantore R, Mangoni di S Stefano C
Boll Soc Ital Biol Sper. 1981 Nov 15;57(21):2116-22.
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-or 75 or 150 g of protein per day. Blood samples were drawn at 4-hr intervals on the 4th and 5th days of each period. Consumption of the protein-free diet caused plasma concentration 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 tended to diminish the amplitude the daily rhythms.
