Two genetic analyses to elucidate causality between body mass index and personality

Background/objectives Many personality traits correlate with BMI, but the existence and direction of causal links between them are unclear. If personality influences BMI, knowing this causal direction could inform weight management strategies. Knowing that BMI instead influences personality would co...

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Published inInternational Journal of Obesity Vol. 45; no. 10; pp. 2244 - 2251
Main Authors Arumäe, Kadri, Briley, Daniel, Colodro-Conde, Lucía, Mortensen, Erik Lykke, Jang, Kerry, Ando, Juko, Kandler, Christian, Sørensen, Thorkild I. A., Dagher, Alain, Mõttus, René, Vainik, Uku
Format Journal Article
LanguageEnglish
Published London Nature Publishing Group UK 01.10.2021
Nature Publishing Group
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ISSN0307-0565
1476-5497
1476-5497
DOI10.1038/s41366-021-00885-4

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Abstract Background/objectives Many personality traits correlate with BMI, but the existence and direction of causal links between them are unclear. If personality influences BMI, knowing this causal direction could inform weight management strategies. Knowing that BMI instead influences personality would contribute to a better understanding of the mechanisms of personality development and the possible psychological effects of weight change. We tested the existence and direction of causal links between BMI and personality. Subjects/methods We employed two genetically informed methods. In Mendelian randomization, allele scores were calculated to summarize genetic propensity for the personality traits neuroticism, worry, and depressive affect and used to predict BMI in an independent sample ( N  = 3 541). Similarly, an allele score for BMI was used to predict eating-specific and domain-general phenotypic personality scores (PPSs; aggregate scores of personality traits weighted by BMI). In a direction of causation (DoC) analysis, twin data from five countries ( N  = 5424) were used to assess the fit of four alternative models: PPSs influencing BMI, BMI influencing PPSs, reciprocal causation, and no causation. Results In Mendelian randomization, the allele score for BMI predicted domain-general ( β  = 0.05; 95% CI: 0.02, 0.08; P  = 0.003) and eating-specific PPS ( β  = 0.06; 95% CI: 0.03, 0.09; P  < 0.001). The allele score for worry also predicted BMI ( β  = −0.05; 95% CI: −0.08, −0.02; P  < 0.001), while those for neuroticism and depressive affect did not ( P  ≥ 0.459). In DoC, BMI similarly predicted domain-general ( β  = 0.21; 95% CI:, 0.18, 0.24; P  < 0.001) and eating-specific personality traits ( β  = 0.19; 95% CI:, 0.16, 0.22; P  < 0.001), suggesting causality from BMI to personality traits. In exploratory analyses, links between BMI and domain-general personality traits appeared reciprocal for higher-weight individuals (BMI > ~25). Conclusions Although both genetic analyses suggested an influence of BMI on personality traits, it is not yet known if weight management interventions could influence personality. Personality traits may influence BMI in turn, but effects in this direction appeared weaker.
AbstractList Background/objectives Many personality traits correlate with BMI, but the existence and direction of causal links between them are unclear. If personality influences BMI, knowing this causal direction could inform weight management strategies. Knowing that BMI instead influences personality would contribute to a better understanding of the mechanisms of personality development and the possible psychological effects of weight change. We tested the existence and direction of causal links between BMI and personality. Subjects/methods We employed two genetically informed methods. In Mendelian randomization, allele scores were calculated to summarize genetic propensity for the personality traits neuroticism, worry, and depressive affect and used to predict BMI in an independent sample (N = 3 541). Similarly, an allele score for BMI was used to predict eating-specific and domain-general phenotypic personality scores (PPSs; aggregate scores of personality traits weighted by BMI). In a direction of causation (DoC) analysis, twin data from five countries (N = 5424) were used to assess the fit of four alternative models: PPSs influencing BMI, BMI influencing PPSs, reciprocal causation, and no causation. Results In Mendelian randomization, the allele score for BMI predicted domain-general ([beta] = 0.05; 95% CI: 0.02, 0.08; P = 0.003) and eating-specific PPS ([beta] = 0.06; 95% CI: 0.03, 0.09; P < 0.001). The allele score for worry also predicted BMI ([beta] = -0.05; 95% CI: -0.08, -0.02; P < 0.001), while those for neuroticism and depressive affect did not (P [greater than or equal to] 0.459). In DoC, BMI similarly predicted domain-general ([beta] = 0.21; 95% CI:, 0.18, 0.24; P < 0.001) and eating-specific personality traits ([beta] = 0.19; 95% CI:, 0.16, 0.22; P < 0.001), suggesting causality from BMI to personality traits. In exploratory analyses, links between BMI and domain-general personality traits appeared reciprocal for higher-weight individuals (BMI > ~25). Conclusions Although both genetic analyses suggested an influence of BMI on personality traits, it is not yet known if weight management interventions could influence personality. Personality traits may influence BMI in turn, but effects in this direction appeared weaker.
Many personality traits correlate with BMI, but the existence and direction of causal links between them are unclear. If personality influences BMI, knowing this causal direction could inform weight management strategies. Knowing that BMI instead influences personality would contribute to a better understanding of the mechanisms of personality development and the possible psychological effects of weight change. We tested the existence and direction of causal links between BMI and personality.BACKGROUND/OBJECTIVESMany personality traits correlate with BMI, but the existence and direction of causal links between them are unclear. If personality influences BMI, knowing this causal direction could inform weight management strategies. Knowing that BMI instead influences personality would contribute to a better understanding of the mechanisms of personality development and the possible psychological effects of weight change. We tested the existence and direction of causal links between BMI and personality.We employed two genetically informed methods. In Mendelian randomization, allele scores were calculated to summarize genetic propensity for the personality traits neuroticism, worry, and depressive affect and used to predict BMI in an independent sample (N = 3 541). Similarly, an allele score for BMI was used to predict eating-specific and domain-general phenotypic personality scores (PPSs; aggregate scores of personality traits weighted by BMI). In a direction of causation (DoC) analysis, twin data from five countries (N = 5424) were used to assess the fit of four alternative models: PPSs influencing BMI, BMI influencing PPSs, reciprocal causation, and no causation.SUBJECTS/METHODSWe employed two genetically informed methods. In Mendelian randomization, allele scores were calculated to summarize genetic propensity for the personality traits neuroticism, worry, and depressive affect and used to predict BMI in an independent sample (N = 3 541). Similarly, an allele score for BMI was used to predict eating-specific and domain-general phenotypic personality scores (PPSs; aggregate scores of personality traits weighted by BMI). In a direction of causation (DoC) analysis, twin data from five countries (N = 5424) were used to assess the fit of four alternative models: PPSs influencing BMI, BMI influencing PPSs, reciprocal causation, and no causation.In Mendelian randomization, the allele score for BMI predicted domain-general (β = 0.05; 95% CI: 0.02, 0.08; P = 0.003) and eating-specific PPS (β = 0.06; 95% CI: 0.03, 0.09; P < 0.001). The allele score for worry also predicted BMI (β = -0.05; 95% CI: -0.08, -0.02; P < 0.001), while those for neuroticism and depressive affect did not (P ≥ 0.459). In DoC, BMI similarly predicted domain-general (β = 0.21; 95% CI:, 0.18, 0.24; P < 0.001) and eating-specific personality traits (β = 0.19; 95% CI:, 0.16, 0.22; P < 0.001), suggesting causality from BMI to personality traits. In exploratory analyses, links between BMI and domain-general personality traits appeared reciprocal for higher-weight individuals (BMI > ~25).RESULTSIn Mendelian randomization, the allele score for BMI predicted domain-general (β = 0.05; 95% CI: 0.02, 0.08; P = 0.003) and eating-specific PPS (β = 0.06; 95% CI: 0.03, 0.09; P < 0.001). The allele score for worry also predicted BMI (β = -0.05; 95% CI: -0.08, -0.02; P < 0.001), while those for neuroticism and depressive affect did not (P ≥ 0.459). In DoC, BMI similarly predicted domain-general (β = 0.21; 95% CI:, 0.18, 0.24; P < 0.001) and eating-specific personality traits (β = 0.19; 95% CI:, 0.16, 0.22; P < 0.001), suggesting causality from BMI to personality traits. In exploratory analyses, links between BMI and domain-general personality traits appeared reciprocal for higher-weight individuals (BMI > ~25).Although both genetic analyses suggested an influence of BMI on personality traits, it is not yet known if weight management interventions could influence personality. Personality traits may influence BMI in turn, but effects in this direction appeared weaker.CONCLUSIONSAlthough both genetic analyses suggested an influence of BMI on personality traits, it is not yet known if weight management interventions could influence personality. Personality traits may influence BMI in turn, but effects in this direction appeared weaker.
Background/objectivesMany personality traits correlate with BMI, but the existence and direction of causal links between them are unclear. If personality influences BMI, knowing this causal direction could inform weight management strategies. Knowing that BMI instead influences personality would contribute to a better understanding of the mechanisms of personality development and the possible psychological effects of weight change. We tested the existence and direction of causal links between BMI and personality.Subjects/methodsWe employed two genetically informed methods. In Mendelian randomization, allele scores were calculated to summarize genetic propensity for the personality traits neuroticism, worry, and depressive affect and used to predict BMI in an independent sample (N = 3 541). Similarly, an allele score for BMI was used to predict eating-specific and domain-general phenotypic personality scores (PPSs; aggregate scores of personality traits weighted by BMI). In a direction of causation (DoC) analysis, twin data from five countries (N = 5424) were used to assess the fit of four alternative models: PPSs influencing BMI, BMI influencing PPSs, reciprocal causation, and no causation.ResultsIn Mendelian randomization, the allele score for BMI predicted domain-general (β = 0.05; 95% CI: 0.02, 0.08; P = 0.003) and eating-specific PPS (β = 0.06; 95% CI: 0.03, 0.09; P < 0.001). The allele score for worry also predicted BMI (β = −0.05; 95% CI: −0.08, −0.02; P < 0.001), while those for neuroticism and depressive affect did not (P ≥ 0.459). In DoC, BMI similarly predicted domain-general (β = 0.21; 95% CI:, 0.18, 0.24; P < 0.001) and eating-specific personality traits (β = 0.19; 95% CI:, 0.16, 0.22; P < 0.001), suggesting causality from BMI to personality traits. In exploratory analyses, links between BMI and domain-general personality traits appeared reciprocal for higher-weight individuals (BMI > ~25).ConclusionsAlthough both genetic analyses suggested an influence of BMI on personality traits, it is not yet known if weight management interventions could influence personality. Personality traits may influence BMI in turn, but effects in this direction appeared weaker.
Background/objectives Many personality traits correlate with BMI, but the existence and direction of causal links between them are unclear. If personality influences BMI, knowing this causal direction could inform weight management strategies. Knowing that BMI instead influences personality would contribute to a better understanding of the mechanisms of personality development and the possible psychological effects of weight change. We tested the existence and direction of causal links between BMI and personality. Subjects/methods We employed two genetically informed methods. In Mendelian randomization, allele scores were calculated to summarize genetic propensity for the personality traits neuroticism, worry, and depressive affect and used to predict BMI in an independent sample ( N  = 3 541). Similarly, an allele score for BMI was used to predict eating-specific and domain-general phenotypic personality scores (PPSs; aggregate scores of personality traits weighted by BMI). In a direction of causation (DoC) analysis, twin data from five countries ( N  = 5424) were used to assess the fit of four alternative models: PPSs influencing BMI, BMI influencing PPSs, reciprocal causation, and no causation. Results In Mendelian randomization, the allele score for BMI predicted domain-general ( β  = 0.05; 95% CI: 0.02, 0.08; P  = 0.003) and eating-specific PPS ( β  = 0.06; 95% CI: 0.03, 0.09; P  < 0.001). The allele score for worry also predicted BMI ( β  = −0.05; 95% CI: −0.08, −0.02; P  < 0.001), while those for neuroticism and depressive affect did not ( P  ≥ 0.459). In DoC, BMI similarly predicted domain-general ( β  = 0.21; 95% CI:, 0.18, 0.24; P  < 0.001) and eating-specific personality traits ( β  = 0.19; 95% CI:, 0.16, 0.22; P  < 0.001), suggesting causality from BMI to personality traits. In exploratory analyses, links between BMI and domain-general personality traits appeared reciprocal for higher-weight individuals (BMI > ~25). Conclusions Although both genetic analyses suggested an influence of BMI on personality traits, it is not yet known if weight management interventions could influence personality. Personality traits may influence BMI in turn, but effects in this direction appeared weaker.
Many personality traits correlate with BMI, but the existence and direction of causal links between them are unclear. If personality influences BMI, knowing this causal direction could inform weight management strategies. Knowing that BMI instead influences personality would contribute to a better understanding of the mechanisms of personality development and the possible psychological effects of weight change. We tested the existence and direction of causal links between BMI and personality. In Mendelian randomization, the allele score for BMI predicted domain-general ([beta] = 0.05; 95% CI: 0.02, 0.08; P = 0.003) and eating-specific PPS ([beta] = 0.06; 95% CI: 0.03, 0.09; P < 0.001). The allele score for worry also predicted BMI ([beta] = -0.05; 95% CI: -0.08, -0.02; P < 0.001), while those for neuroticism and depressive affect did not (P [greater than or equal to] 0.459). In DoC, BMI similarly predicted domain-general ([beta] = 0.21; 95% CI:, 0.18, 0.24; P < 0.001) and eating-specific personality traits ([beta] = 0.19; 95% CI:, 0.16, 0.22; P < 0.001), suggesting causality from BMI to personality traits. In exploratory analyses, links between BMI and domain-general personality traits appeared reciprocal for higher-weight individuals (BMI > ~25). Although both genetic analyses suggested an influence of BMI on personality traits, it is not yet known if weight management interventions could influence personality. Personality traits may influence BMI in turn, but effects in this direction appeared weaker.
Many personality traits correlate with BMI, but the existence and direction of causal links between them are unclear. If personality influences BMI, knowing this causal direction could inform weight management strategies. Knowing that BMI instead influences personality would contribute to a better understanding of the mechanisms of personality development and the possible psychological effects of weight change. We tested the existence and direction of causal links between BMI and personality. We employed two genetically informed methods. In Mendelian randomization, allele scores were calculated to summarize genetic propensity for the personality traits neuroticism, worry, and depressive affect and used to predict BMI in an independent sample (N = 3 541). Similarly, an allele score for BMI was used to predict eating-specific and domain-general phenotypic personality scores (PPSs; aggregate scores of personality traits weighted by BMI). In a direction of causation (DoC) analysis, twin data from five countries (N = 5424) were used to assess the fit of four alternative models: PPSs influencing BMI, BMI influencing PPSs, reciprocal causation, and no causation. In Mendelian randomization, the allele score for BMI predicted domain-general (β = 0.05; 95% CI: 0.02, 0.08; P = 0.003) and eating-specific PPS (β = 0.06; 95% CI: 0.03, 0.09; P < 0.001). The allele score for worry also predicted BMI (β = -0.05; 95% CI: -0.08, -0.02; P < 0.001), while those for neuroticism and depressive affect did not (P ≥ 0.459). In DoC, BMI similarly predicted domain-general (β = 0.21; 95% CI:, 0.18, 0.24; P < 0.001) and eating-specific personality traits (β = 0.19; 95% CI:, 0.16, 0.22; P < 0.001), suggesting causality from BMI to personality traits. In exploratory analyses, links between BMI and domain-general personality traits appeared reciprocal for higher-weight individuals (BMI > ~25). Although both genetic analyses suggested an influence of BMI on personality traits, it is not yet known if weight management interventions could influence personality. Personality traits may influence BMI in turn, but effects in this direction appeared weaker.
Audience Academic
Author Kandler, Christian
Vainik, Uku
Mõttus, René
Jang, Kerry
Arumäe, Kadri
Sørensen, Thorkild I. A.
Ando, Juko
Briley, Daniel
Dagher, Alain
Colodro-Conde, Lucía
Mortensen, Erik Lykke
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BackLink https://www.ncbi.nlm.nih.gov/pubmed/34247202$$D View this record in MEDLINE/PubMed
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CitedBy_id crossref_primary_10_1111_jopy_12836
crossref_primary_10_1016_j_physbeh_2022_113703
crossref_primary_10_5964_ps_7583
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Snippet Background/objectives Many personality traits correlate with BMI, but the existence and direction of causal links between them are unclear. If personality...
Many personality traits correlate with BMI, but the existence and direction of causal links between them are unclear. If personality influences BMI, knowing...
Background/objectives Many personality traits correlate with BMI, but the existence and direction of causal links between them are unclear. If personality...
Background/objectivesMany personality traits correlate with BMI, but the existence and direction of causal links between them are unclear. If personality...
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SubjectTerms 631/208/135
692/700/2817
Alleles
Biological Specimen Banks - statistics & numerical data
Body Mass Index
Body size
Body weight
Causality
Causation
Correlation of Data
Domains
Eating
Epidemiology
Estonia
Genetic analysis
Genetic aspects
Genetic research
Genetic Testing - instrumentation
Genetic Testing - methods
Genetic Testing - statistics & numerical data
Health Promotion and Disease Prevention
Humans
Influence
Internal Medicine
Links
Medicine
Medicine & Public Health
Mendel's law
Mendelian Randomization Analysis
Metabolic Diseases
Neurosis
Personality
Personality - classification
Personality Tests - statistics & numerical data
Personality traits
Psychological aspects
Psychological effects
Public Health
Randomization
Weight
Title Two genetic analyses to elucidate causality between body mass index and personality
URI https://link.springer.com/article/10.1038/s41366-021-00885-4
https://www.ncbi.nlm.nih.gov/pubmed/34247202
https://www.proquest.com/docview/2574932769
https://www.proquest.com/docview/2550628358
Volume 45
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