Cross-sectional and longitudinal changes in body composition, anxiety, and depression in a clinical sample of adolescents with anorexia nervosa.

Objective: Eating disorders among children and adolescents have increased in prevalence, and mortality rates for anorexia nervosa are among the highest for any psychiatric disorder. Our current study aimed to (a) examine the cross-sectional relationship between body composition and anxiety/depressive symptoms among 97 adolescents and young adults who have been diagnosed with anorexia nervosa, (b) examine the longitudinal changes in body composition and anxiety/depressive symptoms over three months (from baseline to follow-up visit), and (c) examine the longitudinal relationship between change in body composition and change in anxiety/depression over three months.

Method: A retrospective chart review was conducted within an interdisciplinary eating disorder clinic between August 2019 and December 2021. In total, 97 adolescents aged 11-20 years old with diagnoses of anorexia nervosa were included in the analyses. Body composition data were collected at each visit along with parent- and youth-report measures of symptoms of anxiety/depression symptoms.

Results: Findings indicated adolescents demonstrated some improvement in body composition, as well as parent-reported reductions in anxiety/depression symptoms. Based on parent reports, increased BMI percentile was associated with improvements in anxiety/depression symptoms. On the other hand, youth did not report significant changes in anxiety/depressive symptoms. Additionally, there were no associated improvements with body composition measures, which may be associated with continued body dissatisfaction or symptoms of anxiety and depression predating the eating disorder.

Conclusions: These results suggest the importance of including interventions addressing depression, anxiety, and body image as part of treatment.