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Taking a Deeper Dive Into OSFED Subtypes: A Meta-Analysis and Systematic Review.

Thanh Ba Dang1, Elizabeth K Hughes1,2,3, An Binh Dang1

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Other Specified Feeding or Eating Disorders (OSFED) show similar psychopathology to full eating disorders (EDs). Atypical anorexia nervosa and night eating syndrome are clinically significant, warranting attention.

Keywords:
OSFEDatypical anorexia nervosabinge‐eating disorderbulimia nervosaeating disordermeta‐analysisnight eating syndromepsychopathologypurging disordersystematic review

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Area of Science:

  • Psychiatry
  • Clinical Psychology
  • Eating Disorders Research

Background:

  • Eating disorders (EDs) encompass a range of conditions, including full-threshold diagnoses and Other Specified Feeding or Eating Disorders (OSFED).
  • OSFED includes diverse presentations like atypical anorexia nervosa (AN), purging disorder (PD), night eating syndrome (NES), and subthreshold presentations of bulimia nervosa (sub-BN) and binge-eating disorder (sub-BED).
  • Understanding the psychopathological severity of OSFED compared to full-threshold EDs and control groups (CGs) is crucial for accurate diagnosis and treatment.

Purpose of the Study:

  • To systematically compare OSFED groups, including specific subtypes, with full-threshold EDs and CGs.
  • To evaluate eating and general psychopathology across different ED classifications.
  • To determine the clinical significance and severity of OSFED presentations.

Main Methods:

  • A comprehensive literature search was conducted across major databases (PsycINFO, Medline, Embase, CINAHL) for studies published between January 2013 and February 2024.
  • Studies meeting DSM-5 diagnostic criteria, assessed via clinical interviews or validated tools, were included.
  • Quality appraisal using an adapted Downs and Black checklist and PROSPERO registration (ID: CRD42022314495) were performed.

Main Results:

  • Meta-analyses of 33 studies revealed that combined OSFED and specific subtypes (atypical AN, NES) exhibited comparable eating psychopathology to full-threshold EDs.
  • Individuals with OSFED demonstrated similar levels of eating and general psychopathology to full-threshold EDs, but significantly higher levels than CGs.
  • Atypical AN and NES were specifically identified as having comparable severity to full EDs, while evidence for sub-BN and sub-BED was limited.

Conclusions:

  • Findings support the conceptualization of atypical AN and NES as clinically significant eating disorders.
  • These OSFED subtypes present with a severity comparable to full-threshold eating disorders.
  • Further research is needed to clarify the psychopathology of subthreshold presentations like sub-BN and sub-BED.