Cited by 4,807Obesity, Physical Activity, DietCancer Risks and FactorsDiabetes, Cardiovascular Risks, and Lipoproteins

Body-mass index and cause-specific mortality in 900 000 adults: collaborative analyses of 57 prospective studies

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Prospective Studies Collaboration·2009·The Lancet

Abstract

Summary Background The main associations of body-mass index (BMI) with overall and cause-specific mortality can best be assessed by long-term prospective follow-up of large numbers of people. The Prospective Studies Collaboration aimed to investigate these associations by sharing data from many studies. Methods Collaborative analyses were undertaken of baseline BMI versus mortality in 57 prospective studies with 894 576 participants, mostly in western Europe and North America (61% [n=541 452] male, mean recruitment age 46 [SD 11] years, median recruitment year 1979 [IQR 1975–85], mean BMI 25 [SD 4] kg/m2). The analyses were adjusted for age, sex, smoking status, and study. To limit reverse causality, the first 5 years of follow-up were excluded, leaving 66 552 deaths of known cause during a mean of 8 (SD 6) further years of follow-up (mean age at death 67 [SD 10] years): 30 416 vascular; 2070 diabetic, renal or hepatic; 22 592 neoplastic; 3770 respiratory; 7704 other. Findings In both sexes, mortality was lowest at about 22·5–25 kg/m2. Above this range, positive associations were recorded for several specific causes and inverse associations for none, the absolute excess risks for higher BMI and smoking were roughly additive, and each 5 kg/m2 higher BMI was on average associated with about 30% higher overall mortality (hazard ratio per 5 kg/m2 [HR] 1·29 [95% CI 1·27–1·32]): 40% for vascular mortality (HR 1·41 [1·37–1·45]); 60–120% for diabetic, renal, and hepatic mortality (HRs 2·16 [1·89–2·46], 1·59 [1·27–1·99], and 1·82 [1·59–2·09], respectively); 10% for neoplastic mortality (HR 1·10 [1·06–1·15]); and 20% for respiratory and for all other mortality (HRs 1·20 [1·07–1·34] and 1·20 [1·16–1·25], respectively). Below the range 22·5–25 kg/m2, BMI was associated inversely with overall mortality, mainly because of strong inverse associations with respiratory disease and lung cancer. These inverse associations were much stronger for smokers than for non-smokers, despite cigarette consumption per smoker varying little with BMI. Interpretation Although other anthropometric measures (eg, waist circumference, waist-to-hip ratio) could well add extra information to BMI, and BMI to them, BMI is in itself a strong predictor of overall mortality both above and below the apparent optimum of about 22·5–25 kg/m2. The progressive excess mortality above this range is due mainly to vascular disease and is probably largely causal. At 30–35 kg/m2, median survival is reduced by 2–4 years; at 40–45 kg/m2, it is reduced by 8–10 years (which is comparable with the effects of smoking). The definite excess mortality below 22·5 kg/m2 is due mainly to smoking-related diseases, and is not fully explained. Funding UK Medical Research Council, British Heart Foundation, Cancer Research UK, EU BIOMED programme, US National Institute on Aging, and Clinical Trial Service Unit (Oxford, UK).

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Authors
Prospective Studies Collaboration
Affiliations
University of Oxford (GB)
Corresponding author
Prospective Studies Collaboration
Venue
The Lancet
Publisher
Elsevier BV
Published
2009-03
Volume
373
Issue
9669
Pages
1083-1096
ISSN
  • 0099-5355 (ISSN-L)
  • 0140-6736
OpenAlex
W2142170772
Cited by
4,807
References
37
Citations by year
2026: 128 · 2025: 224 · 2024: 282 · 2023: 267 · 2022: 282 · 2021: 332 · 2020: 301 · 2019: 268 · 2018: 293 · 2017: 328 · 2016: 300 · 2015: 333 · 2014: 344 · 2013: 312 · 2012: 282
FWCI
269.25
Type
journal article
Language
en
Open access
Locations
  • The Lancet (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Socio-Environmental Systems Modeling (acceptedVersion)
  • LSHTM Research Online (London School of Hygiene and Tropical Medicine) (acceptedVersion)
  • Lirias (KU Leuven) (submittedVersion, other-oa)
  • Research Portal (Queen's University Belfast) (submittedVersion, other-oa)
  • Ghent University Academic Bibliography (Ghent University) (submittedVersion)
  • Adelaide Research & Scholarship (AR&S) (University of Adelaide) (submittedVersion)
  • UCL Discovery (University College London) (submittedVersion)
  • Institutional Repositories DataBase (IRDB) (submittedVersion, cc-by-nc-nd)
  • STM:n Hallinnonalan avoin julkaisuarkisto (Julkari) (submittedVersion)
  • Data Archiving and Networked Services (DANS) (submittedVersion)
Funders
  • Health Research Council of New Zealand
  • Medical Research Council
  • British Heart Foundation
  • National Institute on Aging (P01 AG17625-01)
  • Cancer Research UK
Topics
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Obesity, Physical Activity, Diet
  • Health Sciences › Medicine › Oncology › Cancer Risks and Factors
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes, Cardiovascular Risks, and Lipoproteins
Keywords
body mass index, obesity, cause-specific mortality, all-cause mortality, vascular death, diabetes mortality, renal mortality, respiratory mortality, smoking, excess risk, data sharing, collaborative analysis, reverse causality, cardiovascular disease, cancer risk, respiratory disease risk, liver disease risk, diabetes risk, renal disease risk
MeSH terms
Adult, Aged, Aged, 80 and over, Cause of Death, Female, Humans, Male, Middle Aged, Mortality, Prospective Studies, Respiratory Tract Diseases, Body Mass Index, Myocardial Ischemia, Stroke

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