We searched PubMed, the Web of Science, Embase, Cochrane, the China National Knowledge Infrastructure, WanFang database and Chinese biomedical literature in English or Chinese by three searching strategies in the following: (1) “Inflammatory bowel disease/ Crohn’s disease/ulcerative colitis” as subject heading or its free terms in combination with “sarcopenia” or its free terms; (2)“Inflammatory bowel disease/Crohn’s disease /ulcerative colitis” or its free terms in combination with...