Should you be screening for eating disorders?

The US Preventive Services Task Force recently released its findings on screening for eating disorders—including binge eating, bulimia nervosa, and anorexia nervosa—in adolescents and adults.¹ This is the first time the Task Force has addressed this topic.

For those who have no signs or symptoms of an eating disorder, the Task Force found insufficient evidence to assess the benefits and harms of screening. Signs and symptoms of an eating disorder include rapid changes in weight (gain or loss), delayed puberty, bradycardia, oligomenorrhea, or amenorrhea.¹

Screening vs diagnostic work-up. The term screening means looking for the presence of a condition in an asymptomatic person. Those who have signs or symptoms that could be due to an eating disorder should be assessed for these conditions, but this would be classified as diagnostic testing rather than preventive screening.

Relatively uncommon but serious. The estimated lifetime prevalence of anorexia is 1.42% in women and 0.12% in men; for bulimia, 0.46% in women and 0.08% in men; and for binge eating, 1.25% in women and 0.42% in men.¹ Those suspected of having an eating disorder need psychological, behavioral, medical, and nutritional care provided by those with expertise in diagnosing and treating these disorders. (A systematic review of treatment options was recently published in American Family Physician.²)

If you suspect an eating disorder … Several tools for the assessment of eating disorders have been described in the literature, including the Eating Disorder Screen for Primary Care (EDS-PC) tool, but the Task Force identified enough evidence to comment on the accuracy of only one: the SCOFF questionnaire. There is adequate evidence on its accuracy for use in adult women but not in adolescents or males.¹

The SCOFF tool, which originated in the United Kingdom, consists of 5 questions³:

• Do you make yourself Sick because you feel uncomfortably full?
• Do you worry that you have lost Control over how much you eat?
• Have you recently lost more than One stone (14 lb) in a 3-month period?
• Do you believe yourself to be Fat when others say you are too thin?
• Would you say that Food dominates your life?

A threshold of 2 or more “Yes” answers on the SCOFF questionnaire has a pooled sensitivity of 84% for all 3 disorders combined and a pooled specificity of 80%.⁴

What should you do routinely? For adolescents and adults who have no indication of an eating disorder, there is no proven value to screening. Measuring height and weight, calculating body mass index, and continuing to track these measurements for all patients over time is considered standard practice. For those patients who have signs or symptoms that could be due to an eating disorder, administer the SCOFF tool; further assess those with 2 or more positive responses, and refer for diagnosis and treatment those suspected of having an eating disorder.