1. Introduction
psychological distress, human mood
The rice endosperm protein (REP) hydrolysate containing the following rice endosperm protein derived oligopeptides QQFLPEGQSQSQK, LPEGQSQSQK, and pEQFLPEGQSQSQK (a Rice (REP accounting for approximately 5% of rice endosperm is not only nutritionally important but also shows various physiological functions such as anti-hyperglycemia, anti-hyperuricemia, and anti-obesity when orally administrated [Mental illness threatens many populations today. A great number of people are reported to suffer from psychological distress [Rice endosperm protein hydrolysate (REP hydrolysate) containing the following rice oligo peptides; QQFLPEGQSQSQK, LPEGQSQSQK, and pEQFLPEGQSQSQK (a Two clinical studies were designed: Study 1 for the single-dose effect of REP hydrolysate on human mood and Study 2 for the effect of the repeated intake of REP hydrolysate on human mood. The aim of this study was to evaluate the effects of REP hydrolysate consumption on human mood. 