2.4. Test Foods
The REP hydrolysate was manufactured by Kameda Seika Co., Ltd. (Niigata, Japan). A tablet type food containing REP hydrolysate (25 mg/each) was used as the active food for the REP hydrolysate group. Two tablets were administered per day. Participants were taught to take the daily dosage at once. The concentration of the active peptides or the rice oligo peptides, LPEGQSQSQK, QQFLPEGQSQSQK, and pEQFLPEGQSQSQK (a 