Comparing Psychopathologies Between Anorexia Nervosa-restricting (AN-R) and Binge-eating/Purging (AN-BP) Subtypes
Nhi Nguyen1, Nhien Nguyen3, Kimberly Nguyen4, Ulric Wu4, Blake Woodside5, Pei-an Shih2
1UC San Diego School of Medicine, 2Psychiatry, UC San Diego School of Medicine, 3UC San Diego Skaggs School of Pharmacy and Pharmaceutical Sciences, 4UC San Diego, 5Psychiatry, University of Toronto
Objective:
To compare the psychopathological features of the AN-R and AN-BP subtypes among individuals with active anorexia nervosa (AN).
Background:
AN is a life-threatening eating disorder characterized by two clinical subtypes: restricting (AN-R) and binge-eating/purging (AN-BP).
Design/Methods:
We administered the Eating Disorder Inventory (EDI-3) and Eating Disorder Examination Questionnaire (EDE-Q) to adult women currently ill with AN. Participants were classified by subtype (AN-R or AN-BP). Mann–Whitney U tests were conducted using RStudio to compare subscale and composite scores between subtypes.
Results:
Participants (n=54) had a mean age of 30.7 ± 11.1 years and a mean BMI of 16.7 ± 2.4. The AN-BP group (n = 29) exhibited significantly greater severity than the AN-R group (n = 25) on several EDI-3 subscales: Bulimia (12.69 ± 8.37 vs. 3.80 ± 5.69, p < 0.005), Personal Alienation (16.87 ± 6.32 vs. 12.45 ± 6.76, p = 0.049), Emotional Dysregulation (8.79 ± 6.21 vs. 5.97 ± 6.87, p = 0.044), and Maturity Fears (12.28 ± 6.27 vs. 9.32 ± 6.95 vs, p = 0.049); as well as two EDE-Q subscales: Restraint (3.79 ± 1.75 vs. 2.68 ± 1.76 ; p = 0.028) and Shape Concern (4.51 ± 1.39 vs. 3.45 ± 1.99, p = 0.041) (Mean ± SD; AB-BP vs. AN-R, respectively).
Conclusions:
Distinct psychopathological profiles differentiate the AN-R and AN-BP subtypes. Elevated impulsivity and affective symptoms in AN-BP warrant interventions addressing both impulse control and emotion regulation. These findings underscore the heterogeneity of AN and the importance of subtype-specific treatment approaches. Moreover, neurobiological mechanisms underlying AN may contribute to impaired cognitive flexibility and maladaptive behaviors. Therefore, rigorous neurobiological research is needed to identify novel approaches for improving treatment and outcomes.
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