Cardiovascular
Does higher BMI causally raise heart disease risk?
Open access · cc by · source: Europe PMC
Genetic instruments for BMI suggest a causal increase in ischemic heart disease risk larger than simple observational estimates.
How this study connects
Role on claims
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Observationally, each 4 kg/m² BMI related to about 26% higher IHD odds; the causal instrumental-variable OR was about 1.52 (52% higher). Alleles raised BMI by ~0.28 kg/m² each.
Evidence for the claim as stated.
Not every paper that uses randomisation is an intervention RCT. A Copenhagen Mendelian-randomisation analysis of BMI and ischaemic heart disease uses genotype as an instrumental variable for BMI rather than randomly assigning a diet or drug, so the causal claim is about genetically influenced BMI, not about a treatment protocol.
Evidence for the claim as stated.
Study at a glance
- Design
- Mendelian randomisation — Allele-score MR of BMI on ischemic heart disease in three Danish samples
- N
- N=75627 · CGPS n = 54,613; CCHS n = 10,474; CIHDS n = 10,540; all of Danish descent
- Population
- White adults of Danish descent in two general-population studies and an IHD case collection
- Outcome
- Causal effect of elevated BMI on ischemic heart disease risk
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Does higher BMI causally raise heart disease risk?
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Observational OR ~1.26 pooled; CGPS 1.23
In the general population, for one standard deviation (4 kg/m 2 ) increase in BMI, the observational ORs for IHD were 1.23 (95% CI 1.19–1.28) for the CGPS and 1.31 (95% CI 1.23–1.39) for the CCHS ().
What analytic framework estimates causality?
An alternative approach free of confounding, reverse causation, and bias is that of Mendelian randomisation .
Key findings
Observationally, each 4 kg/m² BMI related to about 26% higher IHD odds; the causal instrumental-variable OR was about 1.52 (52% higher). Alleles raised BMI by ~0.28 kg/m² each.
Methodology
Using Copenhagen cohorts, investigators compared observational BMI–IHD associations with Mendelian randomisation estimates based on FTO, MC4R, and TMEM18 alleles as instruments for BMI.
Limitations
MR supports causality but does not identify which intermediate pathways fully mediate BMI’s effect or the best weight-loss treatment.
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