Atypical eating disorders including binge eating disorder may affect more than half of the people with an eating disorder. These conditions are called ‘atypical’ eating disorders because they do not exactly fit the description of either anorexia nervosa or bulimia nervosa. People might have some of the symptoms of anorexia nervosa and bulimia nervosa (such as dieting, binge eating, vomiting, and a preoccupation with food), but not all; or they might have symptoms that fall between anorexia nervosa; or they might move from one set of problems to another over time. Many people with an atypical eating disorder have suffered with anorexia nervosa or bulimia nervosa in the past.
Taken from NICE guidelines at www.nice.org.uk
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