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Background: A significant body of literature has interrogated the critical role of diet in the development and management of inflammatory bowel disease (IBD). Summary: This review provides a summary and critical appraisal of the literature in this area, focussing on four distinct themes: nutritional epidemiology, animal and in vitro experiments, enteral nutrition, and food-based dietary therapies. Key Messages: Nutritional epidemiology and data from experiments in animals indicate that a western-type diet pattern is associated with increased risk of IBD onset. However, these findings have not been consistently replicated in the dietary management of IBD. Exclusive enteral nutrition (EEN) is the only dietary therapy with reproducible evidence of efficacy in the management of active Crohn’s disease (CD). Use of EEN may also be useful for improving perioperative outcomes in CD, and as an …