Table 2.

Within-Subject Differences for High and Low Dietary Tryptophan Intake

Variable	M	SD		Paired t-test	p
Anxiety
Low Tryptophan	38.0	6.5	>	2.2	.04*
High Tryptophan	35.9	5.7
Positive Affect
Low Tryptophan	16.6	4.1	>	2.8	.01**
High Tryptophan	18.8	3.5
Negative Affect
Low Tryptophan	7.8	2.5	>	.92	N.S.
High Tryptophan	7.5	1.8
Irritability
Low Tryptophan	35.3	11.6	>	2.0	.05*
High Tryptophan	31.7	7.9
Depression
Low Tryptophan	39.6	8.3	>	2.2	.02*
High Tryptophan	37.1	6.2
Cortisol
Low Tryptophan	.2	.1	>	.50	N.S.
High Tryptophan	.2	.09

Note: N = 25

^*p ≤ .05;

^**p ≤ .01