Common Genetic and Environmental Contributions to Anxiety Sensitivity, Anxiety, and Cognitive Symptoms of Eating Disorders in Adolescence.

Anxiety sensitivity may be associated with both anxiety and eating disorder symptoms, which could contribute to the frequent comorbidity of both syndromes. This study examined the common (i.e., correlated) genetic and environmental contributions to anxiety sensitivity, cognitive symptoms of eating disorder severity, and anxiety symptoms to understand their co-occurrence in adolescence. This study analyzed data from the Twins Early Development Study. When twins were 16 years old (N = 5,111 pairs), they self-reported anxiety sensitivity via the Child Anxiety Sensitivity Index and cognitive symptoms of eating disorder severity via four items from the Eating Disorder Diagnostic Scale. Parents reported adolescent anxiety symptoms via the Anxiety Related Behaviour Questionnaire. Common genetic and non-shared environmental factors contributed to phenotypic correlations among cognitive symptoms of eating disorders. Genetic and nonshared environmental influences contributed to anxiety sensitivity and a latent variable of cognitive symptoms of eating disorder severity. Genetic, shared-, and nonshared- environmental influences contributed to anxiety symptoms. Common genetic and nonshared environmental influences contributed to anxiety sensitivity and anxiety symptoms, as well as anxiety sensitivity and cognitive symptoms of eating disorder severity. However, there was no evidence of common genetic or environmental contributions to anxiety symptoms and cognitive symptoms of eating disorder severity. This study implicates anxiety sensitivity as a potential cognitive process associated with both anxiety symptoms and cognitive symptoms of eating disorders.