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Based on estimates derived using mendelian randomization, what is the association between body mass index and cardiometabolic traits?
In this population-based cohort study of approximately 120 000 individuals, associations were identified between body mass index and risk of hypertension, coronary heart disease, type 2 diabetes, and elevated systolic and diastolic blood pressures. No associations between body mass index and stroke or pulse rate were observed.
Body mass index represents an important modifiable factor for ameliorating the risk of cardiometabolic disease in the general population.
Higher body mass index (BMI) is a risk factor for cardiometabolic disease; however, the underlying causal associations remain unclear.
To use UK Biobank data to report causal estimates of the association between BMI and cardiometabolic disease outcomes and traits, such as pulse rate, using mendelian randomization.
Design, Setting, and Participants
Cross-sectional baseline data from a population-based cohort study including 119 859 UK Biobank participants with complete phenotypic (medical and sociodemographic) and genetic data. Participants attended 1 of 22 assessment centers across the United Kingdom between 2006 and 2010. The present study was conducted from May 1 to July 11, 2016.
Main Outcomes and Measures
Prevalence of hypertension, coronary heart disease, and type 2 diabetes were determined at assessment, based on self-report. Blood pressure was measured clinically. Participants self-reported sociodemographic information pertaining to relevant confounders. A polygenic risk score comprising 93 single-nucleotide polymorphisms associated with BMI from previous genome-wide association studies was constructed, and the genetic risk score was applied to derive causal estimates using a mendelian randomization approach.
Of the 119 859 individuals included in the study, 56 816 (47.4%) were men; mean (SD) age was 56.87 (7.93) years. Mendelian randomization analysis showed significant positive associations between genetically instrumented higher BMI and risk of hypertension (odds ratio [OR] per 1-SD higher BMI, 1.64; 95% CI, 1.48-1.83; P = 1.1 × 10−19), coronary heart disease (OR, 1.35; 95% CI, 1.09-1.69; P = .007) and type 2 diabetes (OR, 2.53; 95% CI, 2.04-3.13; P = 1.5 × 10−17), as well as systolic blood pressure (β = 1.65 mm Hg; 95% CI, 0.78-2.52 mm Hg; P = 2.0 × 10−04) and diastolic blood pressure (β = 1.37 mm Hg; 95% CI, 0.88-1.85 mm Hg; P = 3.6 × 10−08). These associations were independent of age, sex, Townsend deprivation scores, alcohol intake, and smoking history.
Conclusions and Relevance
The results of this study add to the burgeoning evidence of an association between higher BMI and increased risk of cardiometabolic diseases. This finding has relevance for public health policies in many countries with increasing obesity levels.
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Accepted for Publication: November 26, 2016.
Corresponding Author: Donald M. Lyall, PhD, Institute of Health and Wellbeing, University of Glasgow, 1 Lilybank Gardens, Glasgow G12 8RZ, Scotland (firstname.lastname@example.org).
Published Online: July 5, 2017. doi:10.1001/jamacardio.2016.5804
Author Contributions: Drs Holmes, Sattar, and Pell contributed equally to the study. Dr Lyall had full access to all the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
Study concept and design: Lyall, Sattar, Holmes.
Acquisition, analysis, or interpretation of data: Lyall, Celis-Morales, Ward, Iliodromiti, Anderson, Gill, Ntuk, Mackay, Holmes, Pell.
Drafting of the manuscript: Lyall.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Lyall.
Obtained funding: Pell.
Administrative, technical, or material support: Celis-Morales, Ward, Smith.
Study supervision: Sattar, Pell, Holmes.
Conflict of Interest Disclosures: All authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. Drs Sattar and Pell are members of UK Biobank scientific committees. This conflict of interest did not affect the present study with regard to motivation, analysis, or interpretation. No other disclosures were reported.
Funding/Support: This research received funding from the Welsh Assembly Government and the British Heart Foundation.
Role of the Funder/Sponsor: The funding sources had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication.
Additional Contributions: We are grateful to UK Biobank participants.
Additional Information: This research was conducted using UK Biobank application 7155. UK Biobank was established by the Wellcome Trust medical charity, Medical Research Council (MRC), Department of Health, Scottish Government and the Northwest Regional Development Agency.
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