Table 2.

Effect of tryptophan-enriched cereal intake on 6-sulfatoxymelatonin (aMT6s), 5-hidroxyindoleacetic acid (5-HIAA), and total antioxidant capacity (TAC)

	Control	Treatment		Posttreatment
		1st day of treatment	7th day of treatment
6-MTS	1	1.04 ± 0.11	1.22 ± 0.06*	0.81 ± 0.10
5-HIAA	1	1.46 ± 0.27	1.90 ± 0.31*	1.26 ± 0.23
TAC	1	1.04 ± 0.02	1.06 ± 0.02*	0.98 ± 0.02

Results are expressed as fold-increase over control levels (normalized and expressed as 1). Each value represents mean ± SEM. Control: first week (22.5 mg of tryptophan was consumed in breakfast and dinner); treatment: second week (60 mg of tryptophan was ingested in breakfast and dinner); posttreatment week: habitual diet

*p < 0.05 control vs. 7th day of treatment; Kruskal–Wallis test and Dunn's multiple comparison test (posttest) were performed; N = 35