Eating disorders (EDs) such as anorexia nervosa, bulimia nervosa, and avoidant/restrictive food intake disorder are associated with restricted diets and abnormal compensatory behaviors, frequently leading to malnutrition and oral and gastrointestinal manifestations. Dental and oral complications are generally caused by malnutrition, micro-nutrient deficiency, and chronic acid exposure; hence, treatment of the ED and frequent dental examinations are essential to reduce morbidity. Gastrointestinal manifestations are multifactorial in origin, and may be caused by disordered behaviors, malnutrition, anxiety, and/or may be a function of the ED itself. This article reviews the most common oral and gastrointestinal manifestations of EDs and describes emergent complications such as acute gastric dilation and superior mesenteric artery syndrome. It is important for providers to recognize complications associated with EDs to provide the best treatment possible.