Effect of Food Intake on Amino Acids in Human Plasma

Abstract
Levels of microbiologically available glycine, isoleucine, tryptophan, and tyrosine in unhydrolyzed human plasma were similar in blood obtained in the fasting state or after food intake. In 1 of 13 experiments histidine was significantly increased (P < 0.01) following eating. In 4 of 11 experiments on eight individuals, arginine was significantly elevated (P < 0.01) after food intake. Of the six amino acids studied, analysis of variance indicated significant variation (P < 0.01) among individuals for tyrosine and arginine only.