Validation of screening questions and symptom coherence of night eating in the Swedish Twin Registry

Background Screening criteria have been used to estimate the prevalence of night eating syndrome (NES), but no validation studies have been conducted. Method We examined the validity of two screening questions for NES using a structured interview with adults enrolled in the Swedish Twin Study of Adults: Genes and Environment (STAGE) study. We also examined the coherence of the proposed diagnostic criteria for NES. A total of 416 participants (men = 179; women = 237) completed the interview and reported complete data for study inclusion. Results The following values were calculated for the screening items after confirmation by interview for men and women, respectively: Positive predictive value =.66 and.67, negative predictive value =.52 and.45, sensitivity =.62 and.63, and specificity =.56 and.50. As increasingly stringent diagnostic criteria were applied to the sample, prevalence of NES dropped. Nocturnal ingestions were more likely to co-occur with other NES symptoms than evening hyperphagia, which occurred frequently, but often in isolation; women were more likely to report a co-occurrence of symptoms than men, who were not likely to report distress related to NES symptoms. Conclusion In sum, almost two-thirds of participants were correctly identified as having NES (without considering distress or impairment) if they answered positively on the screening questions, and about half of the participants were correctly identified as not having NES when answering negatively on the screening questions. Although self-report questions are somewhat informative, a structured interview remains the gold standard for diagnosing NES

Successful Weight Loss Maintenance and a Shift in Identity From Restriction to a New Liberated Self

The present qualitative study aims to explore the experiences of dieters who successfully maintain their weight loss with a focus on the transition in perception of self from their heaviest to their current reduced weight. Ten successful women from a slimming club who had lost at least 10 per cent of their weight for a minimum of one year participated in the study. The results showed an identity shift from a previous restrained self towards a liberated individual, regarding their social interactions, dietary habits, emotional regulation and self-appraisal. The results are discussed in terms of the process of reinvention and the impact of stigma on an obese person’s self-identity