Leucine content of dietary proteins is a determinant of postprandial skeletal muscle protein synthesis in adult rats

Table 2 Comparison of test diet amino acid compositions with NRC requirements ^1,2

Amino Acid	Wheat Diet	Soy Dietg/kg diet	Egg Diet	Whey Diet	NRC Requirement
Phenyalanine + Tyrosine	11.5	17.0	16.8	10.7	1.9
Histidine	3.1	4.2	3.9	3.4	0.8
Isoleucine	5.1	8.1	9.0	10.5	3.1
Leucine	11.5	13.6	14.9	18.5	1.8
Lysine³	4.7(+10.1)	10.7	11.0	15.4	1.1
Methionine + Cysteine	6.5	4.4	13.9	7.6	2.3
Threonine	4.4	6.5	7.6	10.9	1.8
Tryptophan	2.2	2.0	2.7	2.7	0.5
Valine	7.6	8.0	11.5	10.2	2.3

¹Table 2–2 from Nutrient Requirements of Laboratory Animals Fourth Revised Edition [11].
²Values calculated for 300 g rat at maintenance.
³Vital Wheat Gluten supplemented with 10.6 g L-lysine/kg diet to match Whey Protein Isolate.

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