ArticleBMJ public health2026
Body mass index and workplace bullying: exploring causality in two general population Norwegian surveys, the HUNT study and the Norwegian Mother, Father and Child Cohort Study (MoBa).
Article in BMJ public health, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Introduction: To interrogate whether reported associations between body mass index (BMI) and workplace bullying (WPB) reflect an impact of weight on bullying, an impact of bullying on weight or confounding. Methods: We use data from working-age participants in two large, general population Norwegian surveys, the Trøndelag Health Study (HUNT, N=32 826) and the Norwegian Mother, Father and Child Cohort Study (MoBa mothers, N=14 076). To interrogate causal mechanisms, we apply genetic instrumental variable analysis (Mendelian randomisation) and, in HUNT only, bidirectional longitudinal analysis. Results: In cross-sectional analysis in both surveys, participants with a higher BMI were slightly more likely to report concurrent WPB, adjusted for confounders including socioeconomic position and psychological distress (meta-analysed absolute risk difference, ARD: 0.22% per kg/m Conclusions: In two large Norwegian surveys, we found inconclusive evidence from genetic models that higher BMI increased the risk of WPB. Longitudinal analysis (possible only in HUNT) found mixed evidence that higher BMI increased risk of WPB, but clearly suggested that WPB affected BMI over time, consistent with an impact of psychosocial stress on BMI. Results underscore the negative consequences of WPB for physical as well as mental health.
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