A preventive or ameliorating agent for age-related cognitive dysfunction, a neurotrophin 3 enhancer, a preventive or ameliorating agent for age-related decline in motivation, and a method for producing these.

摘要

PROBLEM TO BE SOLVED: To provide an agent for preventing or ameliorating cognitive dysfunction associated with aging and an agent for enhancing neurotrophin 3. A tea leaf or an agent for preventing or ameliorating cognitive dysfunction associated with aging, which comprises a tea leaf or a tea leaf extract which is an extract of the tea leaf, wherein the tea leaf and the tea leaf extract are non-gallate type catechin and theogallin. The ratio of theogallin molar concentration (μmol / L) to the molar concentration of non-gallate catechin (μmol / L) is 0.3 or more, a preventive or ameliorating agent for cognitive dysfunction associated with aging, and , A tea leaf or a tea leaf extract which is an extract of the tea leaf, which is a enhancer of neurotrophin 3, wherein the tea leaf and the tea leaf extract contain non-gallate type catechin and theogallin, and the non-gallate type catechin. A neurotrophin 3 enhancer in which the ratio of theogallin molar concentration (μmol / L) to molar concentration (μmol / L) is 0.3 or more. [Selection diagram] Fig. 3