PROBLEM TO BE SOLVED: To provide a composition that can prevent or treat NASH and a composition that can improve insulin resistance.SOLUTION: The present invention provides compositions comprising Corbicula extract for the prevention or treatment of non-alcoholic steatohepatitis (NASH), improvement in insulin resistance, and Elovl6 inhibition.SELECTED DRAWING: NoneCOPYRIGHT: (C)2017,JPO&INPIT【課題】NASHの予防又は治療可能な組成物、インスリン抵抗性を改善できる組成物を提供する。【解決手段】シジミ抽出物を含む、非アルコール性脂肪性肝炎(NASH)の予防又は治療用、インスリン抵抗性改善用並びにElovl6阻害用組成物。【選択図】なし