Lifetime body mass index and later atherosclerosis risk in young adults: Examining causal links using Mendelian randomisation approach in the Cardiovascular Risk in Young Finns Study

M Kivimäki, G Davey Smith, N J Timpson, D A Lawlor, G D Batty, M Kahonen, M Juonala, T Rönnemaa, J S A Viikari, T Lehtimäki, O T Raitakari

Research output: Contribution to journalArticle (Academic Journal)peer-review

47 Citations (Scopus)

Abstract

Aims Mendelian randomization uses genetic variants related to environmentally modifiable risk factors in an attempt to improve causal inference from observational data. We examined the effect of lifetime body mass index (BMI) on adult carotid intima-media thickness (CIMT) and various atherosclerotic risk factors by using both Mendelian randomization and conventional analyses. Methods and results A total of 2230 individuals (1218 women), aged 3–18 at study induction, took part in clinical examinations in 1980, 1983, 1986, and, most recently, 2001 when they were aged 24–39. In these analyses we utilized the known relation between FTO polymorphism rs9939609 and BMI. The dose–response association between the number of A alleles in FTO and higher mean BMI from childhood to adulthood was confirmed, but no associations with potential confounding factors were observed. In standard regression models, lifetime BMI was associated with adult CIMT, lifetime systolic blood pressure, adult fasting glucose, and adult HOMA-index. When variation in FTO was used as an instrument for unconfounded BMI levels, similar or larger effects of lifetime BMI on all these phenotypes were found, although with wider confidence intervals. Conclusion Mutually supportive results from Mendelian randomization and standard
Translated title of the contributionLifetime body mass index and later atherosclerosis risk in young adults: Examining causal links using Mendelian randomisation approach in the Cardiovascular Risk in Young Finns Study
Original languageEnglish
Pages (from-to)2552 - 2560
Number of pages8
JournalEuropean Heart Journal
Volume29
DOIs
Publication statusPublished - Oct 2008

Bibliographical note

Publisher: Oxford University Press

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