People with more (relative to less) appearance focused self-concept are more likely to engage in disordered eating behaviours over time. Yet, overlooked is whether this relationship occurs at the within-person level and over the course of a day. My thesis addressed these two gaps in knowledge. I examined the psychometric properties of a short measure of appearance focused self-concept for use in experience sampling research. I also examined links with daily disordered eating. Participants were 47 female university students. They completed questionnaires seven times a day for 14 days. Results showed that the measure of appearance focused self-concept was both valid and reliable. Also, greater appearance focused self-concept at the start of the day and increases in appearance focused self-concept over the course of the day were each associated with same-day and next-day disordered eating. These findings indicate that the relation between appearance focused self-concept and disordered eating is ergodic.
Appearance focused self-concept predicts disordered eating behaviour: An experience sampling studyExisting research on disordered eating behaviours has shown that having an appearance focused self-concept increases an individual's propensity to engage in disordered eating behaviours such as binge eating. However, there are currently two limitations within the current research. Firstly, theory suggests that within-person increases in appearance focused self-concept increases disordered eating, but most of the research on appearance focused self-concept and disordered eating behaviours has used a between-person approach, rather than a within-person approach. Secondly, the within-person link between appearance focused self-concept and disordered eating likely occurs over a short timescale. Yet, in longitudinal research, large gaps of time are often used when measuring appearance focused self-concept and disordered eating over time, such as months or years. In my thesis research, I addressed these two limitations. More specifically, I examined the relation between appearance focused self-concept and disordered eating at the within-person level, over the course of a day, and between days.
Appearance focused self-concept and disordered eatingThe self-concept refers to an individual's cognitive framework encompassing their selfperception and personal identity (Rosenberg, 1979). It comprises a collection of beliefs pertaining to various aspects of one's life, including but not limited to interpersonal relationships, education, career, physical health, appearance, and financial status. The domains of the selfconcept may vary among individuals. For instance, an individual's self-concept might incorporate different domains such as being a teacher, a mother, a sister, hailing from Italy, and having a penchant for reading. As well, the different domains vary in terms of their perceived importance for self-definition and self-worth.