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<p>Increasing rates of adolescents experiencing higher body weight have emerged as a significant global public health issue. Links between physical fitness and wellbeing in younger cohorts are well-established; yet, the influence of body image on this relationship has not received as much attention. This study seeks to address this research gap by examining the mediating role of body image on body mass index (BMI) and subjective wellbeing (SWB). Employing partial least squares structural equation modeling (PLS-SEM), this study analyzes data from the Program for International Student Assessment (PISA). The initial sample comprised 80,039 15-year-olds, of which 61,381 met the inclusion criteria. Body image was assessed using the Positive Body Image (PBI) questionnaire, and subjective wellbeing was measured via the SWB questionnaire. A structural mediation model was built to assess the degree to which PBI mediates the link between BMI and SWB. Findings show that BMI is positively associated with SWB (std. β = 0.065, <i>p</i>-value &lt; 0.001), but negatively associated with PBI (std. β=-0.199, <i>p</i>-value &lt; 0.001), and that PBI significantly mediates the relationship between BMI and SWB (β=-0.095, <i>p</i>-value &lt; 0.001). PBI acts as a significant mediator that affects the relationship between BMI and SWB. Findings highlight the need for psychological interventions that account for the complex effects of BMI on SWB. Implications extend to the field of adolescent health and psychology, emphasizing the importance of considering psychosomatic factors in addressing obesity-related issues among adolescents.</p>

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BMI, body image, and subjective wellbeing: a cross-national study of relations among 61,381 15-year-olds

  • 期刊论文

  • 发表日期：

    2025年6月16日

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  • Ji Liu,
  • Mengjiao Xue,
  • Millicent Aziku

摘要

Increasing rates of adolescents experiencing higher body weight have emerged as a significant global public health issue. Links between physical fitness and wellbeing in younger cohorts are well-established; yet, the influence of body image on this relationship has not received as much attention. This study seeks to address this research gap by examining the mediating role of body image on body mass index (BMI) and subjective wellbeing (SWB). Employing partial least squares structural equation modeling (PLS-SEM), this study analyzes data from the Program for International Student Assessment (PISA). The initial sample comprised 80,039 15-year-olds, of which 61,381 met the inclusion criteria. Body image was assessed using the Positive Body Image (PBI) questionnaire, and subjective wellbeing was measured via the SWB questionnaire. A structural mediation model was built to assess the degree to which PBI mediates the link between BMI and SWB. Findings show that BMI is positively associated with SWB (std. β = 0.065, p-value < 0.001), but negatively associated with PBI (std. β=-0.199, p-value < 0.001), and that PBI significantly mediates the relationship between BMI and SWB (β=-0.095, p-value < 0.001). PBI acts as a significant mediator that affects the relationship between BMI and SWB. Findings highlight the need for psychological interventions that account for the complex effects of BMI on SWB. Implications extend to the field of adolescent health and psychology, emphasizing the importance of considering psychosomatic factors in addressing obesity-related issues among adolescents.