The existence of Umami, proposed by Prof. Ikeda as the fifth taste following sweetness, sourness, saltiness, and bitterness, was disputed in academic circles for a long time. However, glutamic acid receptors were subsequently found in the sensory cells in taste buds on the surface of the tongue, and nowadays, Umami has become an internationally-recognized word. In addition, a physiological theory has been proposed that receptors exist in digestive organs, and that Umami helps stimulate digestion when it enters the stomach. Based on these developments, Umami-related research is also expected to become academically prevalent in the fields of medicine and physiology from here on.