PROBLEM TO BE SOLVED: To provide a composition useful for improving obesity, treatment of diabetes, or the like.SOLUTION: This invention provides a composition comprising hydroxytyrosol or salt thereof.COPYRIGHT: (C)2015,JPO&INPIT【課題】肥満の改善及び糖尿病の治療等に有用な組成物の提供。【解決手段】ヒドロキシチロゾール又はその塩を含む組成物。【選択図】なし