Distinguishing delusional beliefs from overvalued ideas in Anorexia Nervosa: An exploratory pilot study

Plain English Summary Anorexia Nervosa (AN) is notable for the individual's conviction that they need to lose weight-even when they are dangerously underweight- or to prevent weight gain. However, how these beliefs relate to the emotional experience of the body, in the presence of AN need to be explored further. This study begins to examine this relationship. Twenty-one adults (95% women; average age 27 years) receiving in-patient treatment for AN were asked a series of questions related to beliefs about their body. To allow a comparison between the level-of-insight and body shape dissatisfaction, participants were also asked to rate how satisfied or dissatisfied they were about their body shape. Almost 25% of the sample had beliefs of delusional intensity about their body shape. Further, it was also found that people with AN who had stronger beliefs of delusional intensity were more likely to be dissatisfied with their body shape. This pilot study appears to support previous research that suggests that some individuals with AN have stronger beliefs of delusional intensity. The findings from the current study should be extended with future research looking at the impact of beliefs on illness and treatment. Background Characterised by the belief that more weight needs to be lost-despite emaciation, failing organs, medical instability and prospect of death-Anorexia Nervosa (AN) is a condition in which irrational, and highly-skewed, beliefs can be of delusional intensity. However, the nexus between delusion and rational awareness and how this is related to body image acceptance and perception has yet to be examined in AN. The current study aims to investigate the relationship between body dissatisfaction and beliefs of delusional intensity in an adult AN inpatient sample. Methods Twenty-one adults (n((women)) = 20; n((men)) = 1), with a mean age of 27 years old (SD = 10), presenting for inpatient treatment for AN (ranging in severity from mild to severe; M-(Body Mass Index) = 17 kg/m(2); M-(Length of Stay) = 22 days) participated in the study. Participants' dominant beliefs (related to AN) and level of insight (delusional; overvalued idea; or fair insight) were measured using either the Brown Assessment of Beliefs Scale (BABS) or the Nepean Beliefs Scale (NBS). The degree of body dissatisfaction was determined by examining the discrepancy between "perceived" and "ideal" body perception. To determine subjective and objective beliefs both the Contour Drawing Rating Scale (subjective) and computerised Body Image Assessment Software (objective) were used. Results Almost one quarter (23.7%; n = 5) of participants appeared to have beliefs of delusional intensity related to their body shape (M = 27.4; SD = 23.03). Although a positive linear trend was indicated, there were no significant differences in body dissatisfaction scores between level-of-insight. Individuals whose belief was categorised as delusional were more likely to hold a negative affective body image state based on their ratings on the body image state survey when compared to the group who had good/fair insight (95% CI [0.53, 18.19]; p = 0.03). Conclusions The current exploratory pilot study concurs with others in the published literature that demonstrate that approximately 25 percent of participants with AN may have delusional ideas. The implications for treatment in similar samples warrant attention. Future research should also seek to understand the clinical significance of this delusional categorisation, the benefits of its utility in this population, and its relation to the severity of AN or stage of illness.