Abstract
In Japan, patients with taste disorder are increasing. The incidence of taste disorder due to diet(insufficient intake of zinc)is especially high. For diagnosis of zinc deficiency, we have been using the measurement of serum zinc usually. However, we have not yet had the definite cut off value until now. Therefore, we would like to propose the value less than 80µg/dl as clinical diagnosis value of zinc deficiency, referring to the many reports and the conclusion of Yokoi's study(Association between plasma zinc concentrations and zinc kinetic parameters in pre-menopausal women. ).