1. Departments of Nutritional Science and Nursing, Faculty of Health and Welfare Science, Okayama Prefectural University, 111 Kuboki, Soja, Okayama 719-1197, Japan, Division of Nutritional Science, Faculty of Food Culture, Kurashiki Sakuyo University, Kurashiki, Okayama 710-0292, Japan, and Industrial Technology Center of Okayama Prefecture, 5301 Haga, Okayama 701-1296, Japan