Agent for improving taste disorder and/or appetite disorder, having glutamic acid as active ingredient

The invention provides an agent for improving or treating taste disorders and/or appetite disorders that has glutamic acid or a salt thereof as an active ingredient. In particular, the invention is effective against taste disorders and/or appetite disorders that arise during chemotherapy in cancer patients and also effective in taste disorders and/or appetite disorders of patients in whom the taste receptor T1R3 has been attenuated by diabetes or nephritis.