Body Mass is Linked With a Broad Range of Personality Nuances, but Especially Those With Behavioral Content: A Multi-Sample Exploration

Authors

  • Kadri Arumäe Orcid
    Institute of Psychology, University of Tartu, Tartu, Estonia
  • Uku Vainik Orcid
    Institute of Psychology, University of Tartu, Tartu, Estonia; Montreal Neurological Institute, McGill University, Montreal, Canada
  • René Mõttus Orcid
    Institute of Psychology, University of Tartu, Tartu, Estonia; Department of Psychology, University of Edinburgh, Edinburgh, United Kingdom

Abstract

Various personality domains and facets correlate with body mass index (BMI), but recent studies suggest that using narrower personality traits—nuances—could contribute to a more detailed understanding of personality–body weight associations. We used three large datasets with different inventories to describe nuances’ correlations with BMI and explore whether BMI predominantly correlated with affective, behavioral, cognitive, or motivational item content. BMI correlated with many nuances, most prominently those reflecting immoderation, lack of orderliness, talkativeness, leadership tendencies, anger, traditionalism, and preference for routine. The highest nuance-level correlation was .21, compared to .11 for the Five-Factor Model domains. BMI correlated most strongly with nuances predominantly reflecting behaviors. Nuance-based approaches can thus reveal the strength, multitude, and content-nature of personality–outcome correlations that can potentially remain hidden in broader traits. If personality traits become relevant in the prevention or treatment of obesity, a focus on narrow behavioral traits may be especially warranted.