On the Efficacy of Self-Induced Vomiting (Purging)

A single in-lab assessment of caloric consumption, loss, and retention during binge-purge episodes in individuals with bulimia nervosa (BN) is frequently cited as evidence that purging via self-induced vomiting is an ineffective strategy for calorie disposal and weight control (Kaye, Weltzin, Hsu, McConaha, & Bolton, 1993). These findings have been widely interpreted to mean that, on average, purging  rids the body of only about half of the calories consumed, regardless of total quantity.

However, a closer examination of the study does NOT support the notion that purging is an ineffective compensatory behavior. Indeed, the findings of Kaye et al. (1993) would appear to have been both misunderstood and overgeneralized in the subsequent decades. This has important implications for therapeutic alliance in clinical practice as well as for understanding the nature of symptoms, metabolic processes, and physiological alterations in EDs.


The study included 17 individuals, all of … Continue reading →

Culture and Eating Disorders: Treatment Outcomes in Singapore and Hong Kong

In this last post about eating disorders in Singapore, I’ll write about the one Singapore-based retrospective outcome study in relation to a similar retrospective study conducted in Hong Kong.

In the Singapore study, researchers reviewed the charts of 94 patients diagnosed with anorexia nervosa from 1992 to 2004 at the National University Hospital, looking back from the time of the study. They didn’t contact any of the subjects for follow-up. 49 were first seen as inpatients, 34 as outpatients, and 11 were seen as outpatients but later admitted. The hospital doesn’t have a specialized ED service, so the authors relied on dietetic notes that unfortunately don’t provide a full picture of the patients’ eating disordered behaviors and cognitions.

The authors wrote about patient ‘improvement’ (not recovery!) as making a weight gain of at least 0.5 kg, or about 1 pound. 83% of their patients attended follow up appointments, which lasted … Continue reading →