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Association of current and former smoking with body mass index: A study of smoking discordant twin pairs from 21 twin cohorts
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2018 (Engelska)Ingår i: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 13, nr 7, artikel-id e0200140Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Background Smokers tend to weigh less than never smokers, while successful quitting leads to an increase in body weight. Because smokers and non-smokers may differ in genetic and environmental family background, we analysed data from twin pairs in which the co-twins differed by their smoking behaviour to evaluate if the association between smoking and body mass index (BMI) remains after controlling for family background.

Methods and findings

The international CODATwins database includes information on smoking and BMI measured between 1960 and 2012 from 156,593 twin individuals 18–69 years of age. Individual-based data (230,378 measurements) and data of smoking discordant twin pairs (altogether 30,014 pairwise measurements, 36% from monozygotic [MZ] pairs) were analysed with linear fixed-effects regression models by 10-year periods. In MZ pairs, the smoking co-twin had, on average, 0.57 kg/m2 lower BMI in men (95% confidence interval (CI): 0.49, 0.70) and 0.65 kg/m2 lower BMI in women (95% CI: 0.52, 0.79) than the never smoking co-twin. Former smokers had 0.70 kg/m2 higher BMI among men (95% CI: 0.63, 0.78) and 0.62 kg/ m2 higher BMI among women (95% CI: 0.51, 0.73) than their currently smoking MZ co-twins. Little difference in BMI was observed when comparing former smoking co-twins with their never smoking MZ co-twins (0.13 kg/m2, 95% CI 0.04, 0.23 among men; -0.04 kg/m2, 95% CI -0.16, 0.09 among women). The associations were similar within dizygotic pairs and when analysing twins as individuals. The observed series of cross-sectional associations were independent of sex, age, and measurement decade.

Conclusions

Smoking is associated with lower BMI and smoking cessation with higher BMI. However, the net effect of smoking and subsequent cessation on weight development appears to be minimal, i.e. never more than an average of 0.7 kg/m2 

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Public Library of Science , 2018. Vol. 13, nr 7, artikel-id e0200140
Nyckelord [en]
adult, aged, article, body mass, controlled study, female, human, major clinical study, male, remission, smoking cessation
Nationell ämneskategori
Folkhälsovetenskap, global hälsa, socialmedicin och epidemiologi
Identifikatorer
URN: urn:nbn:se:hj:diva-41670DOI: 10.1371/journal.pone.0200140ISI: 000438457400025PubMedID: 30001359Scopus ID: 2-s2.0-85049777857Lokalt ID: HHJARNISOAI: oai:DiVA.org:hj-41670DiVA, id: diva2:1252210
Tillgänglig från: 2018-10-01 Skapad: 2018-10-01 Senast uppdaterad: 2018-11-01Bibliografiskt granskad

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Dahl Aslan, Anna K.

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