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Body weight in bulimia nervosa
K A Gendall1, C M Bulik, P F Sullivan
1Western Psychiatric Institute and Clinic, University of Pittsburgh Medical Center, PA, USA.
Eating and Weight Disorders : EWD
|March 23, 2000
Summary
Cognitive Behavioral Therapy (CBT) for bulimia nervosa did not significantly change body mass index (BMI). However, factors like age and binge eating frequency predicted weight gain, while vomiting frequency and body dissatisfaction predicted weight loss during treatment.
Area of Science:
- Psychiatry
- Clinical Psychology
- Eating Disorders Research
Background:
- Bulimia nervosa is an eating disorder characterized by binge eating and compensatory behaviors.
- Body Mass Index (BMI) is a key metric in assessing health status, but its changes during treatment for eating disorders require further investigation.
- Cognitive Behavioral Therapy (CBT) is a common treatment for bulimia nervosa, yet its impact on weight requires clarification.
Purpose of the Study:
- To identify factors associated with BMI in women with bulimia nervosa before treatment.
- To assess BMI changes during a 12-week course of CBT for bulimia nervosa.
- To determine predictors of weight change during CBT for bulimia nervosa.
Main Methods:
- Ninety-four women diagnosed with DSM-III-R bulimia nervosa participated in a randomized clinical trial of CBT.
- Measurements of eating disorder symptomatology, psychopathology, and BMI were taken before and after the 12-week treatment period.
- Statistical analyses were performed to identify associations and predictors of BMI and weight change.
Main Results:
- Lower pre-treatment BMI was linked to a history of anorexia nervosa, substance use, smoking, and frequent vomiting.
- Reductions in binge eating, purging, and food restriction did not lead to significant BMI changes post-treatment.
- Predictors of weight gain included increasing age, higher maximum lifetime weight, and frequent binge eating; predictors of weight loss included frequent vomiting and high body dissatisfaction.
Conclusions:
- CBT for bulimia nervosa generally does not result in substantial weight gain, reassuring patients concerned about this side effect.
- Identifying individuals at risk for significant weight fluctuations during CBT allows for targeted therapeutic interventions to manage body weight effectively.