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Obesity and Overweight in Relation to Mortality in Men with and Without Type 2 Diabetes/Impaired Glucose Tolerance: the Original Whitehall Study

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Obesity and Overweight in Relation to Mortality in Men with and Without Type 2 Diabetes/Impaired Glucose Tolerance: the Original Whitehall Study Diabetes Care Publish Ahead of Print, published online July 10, 2007 Obesity and overweight in relation to mortality in men with and without type 2 diabetes/impaired glucose tolerance: the original Whitehall study Received for publication 12 February 2007 and accepted in revised form 29 May 2007. Running title: Obesity and mortality in type 2 diabetes/IGT G. David Battya PhD Mika Kivimakib PhD George Davey Smithc MD Michael G. Marmotb FRCP Martin J. Shipleyb MSc aMRC Social & Public Health Sciences Unit, University of Glasgow, Glasgow bEpidemiology and Public Health, University College London, London cSocial Medicine, University of Bristol, Bristol Correspondence to: G. David Batty MRC Social & Public Health Sciences, Unit 4 Lilybank Gardens, Glasgow, UK, G12 8RZ. E-mail: [email protected]. 1 Copyright American Diabetes Association, Inc., 2007 In studies of apparently healthy persons, the questionnaire enquiry “are you, or have you overweight and obesity, typically assessed using been, diabetic?”; and impaired glucose tolerance body mass index (BMI), have been consistently (IGT) as 5.4 to 11.0 mmol/l (96 to 199 associated with an increased risk of all-cause mg/100ml). All other men were denoted mortality, cardiovascular disease (CVD) and normoglycaemic. We excluded 48 men who selected cancers.1-4 However, extrapolating reported that their diabetes was controlled by these results to individuals with type 2 diabetes is insulin medication (type I diabetics), and 135 complex and perhaps inappropriate. Studies of whose status could not be ascertained owing to the influence of obesity and overweight on missing data. mortality risk in persons with type 2 diabetes reveal highly inconsistent findings. With all- Preliminary analyses showed that the weight– cause mortality, obesity shows inverse,5;6 mortality gradient in men with impaired glucose positive,7-10 null,11-16 and “J”- or “U”- tolerance (N=1030) and in those with type 2 shaped17-19 associations; similarly discrepant diabetes (N=195) was very similar. That is, there results are apparent with coronary heart disease was no suggestion that the weight–all-cause (CHD).10;12;20;21 This discordance may be at mortality relation differed between the IGT least partially explained by methodological (hazards ratio per increase in weight category; limitations in some studies, such as a modest 95% CI: 1.12; 1.00, 1.25) and the diabetes group sample size; a differential categorization of (1.19; 0.94, 1.49; p-value for difference in weight across studies; a tendency not to separate gradient between groups=0.64). Similar results diabetes into its two main subtypes; and a failure were apparent when cardiovascular disease to adjust for potentially important mediating and (CVD) was the outcome of interest (p-value for confounding variables. Using extended follow- difference=0.98). We therefore combined the up of a UK prospective cohort study, we IGT and type 2 diabetes groups; an approach we addressed this paucity of evidence and have taken elsewhere.26 methodological shortcomings. A total of 18,863 men (99.2% of participants in Research Design and Methods baseline survey) were traced using the National In the Whitehall study, data were collected on Health Service Central Registry until 30th 19,019 male government employees aged from September 2005. The present analyses are based 40 to 69 years when examined between 1967 and on 18,360 with complete data (679 men with 1970, representing a 74% response.22 Height missing continuous data had values imputed27). and weight were measured using standard Hazard ratios and accompanying confidence protocols, and BMI was computed (weight intervals were computed using Cox's [kg]/height2 [m2]) and categorized:23 normal proportional hazards regression model with weight (18.5–<25.0 kg/m2), overweight (25.0– follow up period as the time scale.28 29.99 kg/m2) and obesity (≥30.0 kg/m2). Results After an overnight fast, capillary blood samples Relative to the normoglycaemic group, there was were drawn two hours after consumption of a an elevated risk of death from all-causes (fully glucose preparation equivalent to 50g of adjusted hazard ratio; 95% CI: 1.26; 1.18, 1.35), anhydrous dextrose; blood sugar concentration CVD (1.28; 1.17, 1.41) and, particularly, CHD was estimated using the ferricyanide reduction (1.35; 1.20 , 1.50) in men with diabetes/IGT. In micromethod on an autoanalyser (Technicon examining the relation of BMI with mortality method N-9a).22 Using categories previously experience in men with diabetes/IGT (table 1), utilized in the Whitehall study,24-26 diabetes the greatest age-adjusted risk of all-cause (1.61; was defined as blood glucose of ≥11.1 mmol/l 1.28, 2.02), CVD (1.92; 1.43, 2.59) and CHD (≥200 mg/100ml) and/or a positive response to (2.20; 1.57, 3.14) mortality was apparent in 2 obese individuals. There was also an cancers in the diabetes/IGT group, the first time incremental effect across the weight groups this link has been examined. (p[trend]<=0.008). Control for a range of confounding and mediating factors led to some Confounding and selection bias may plausibly attenuation of these gradients. Very similar explain the associations reported herein. overweight/obesity–mortality relations were seen However, we controlled for a range of variables in men who were free of type 2 diabetes/IGT (p- and loss to follow-up was very low. Study value for interaction for gradients by diabetes weaknesses should be considered. First, the status≥ 0.45). assessment of obesity and overweight was based on BMI, a widely used index of overall adiposity To explore the effect of unmeasured co- but one that does not provide an indication of fat morbidity at study induction, we related weight distribution. Second, because weight, to mortality experience after dropping deaths confounders and mediators may fluctuate over occurring within the first 10 years of mortality time, it is preferable to have more than a single surveillance, and after fitting interaction terms baseline measurement. However, in a recent re- for the BMI categories with the logarithm of the survey of surviving members of this cohort29 follow-up time. In both cases the weight- there were too few deaths in those with mortality relation was somewhat strengthened, diabetes/IGT to examine this issue. particularly for non-CVD outcomes in the latter analyses. In conclusion, this study found support for an elevated risk of mortality from all-causes, CVD, Conclusions and CHD in obese or overweight middle-aged In men with baseline diabetes/IGT, we found an men with and without diabetes/IGT at study elevated rate of all-cause, CVD, and CHD induction. Overweight or obesity should mortality in the obese and overweight groups. therefore be avoided in both these groups. Our findings of a positive association between weight and all-cause mortality accords with some,6-10 if not all, reports.5;6 11-16 Similarly, other investigators have reported an elevated risk Acknowledgements of CVD or CHD in men with higher The original screening of the Whitehall study BMI,10;12;20 as we did; again, however, this is was funded by Health and Social Security and not a universal finding.21 The strength of the the Tobacco Research Council. David Batty is a BMI–mortality gradient was essentially the same Wellcome fellow; Michael Marmot is a MRC in men without diabetes/IGT. We found no Research Professor. Martin Shipley is supported strong suggestion of a link between BMI and all by the British Heart Foundation; Mika Kivimaki by the Academy of Finland. 3 References 1. Batty GD, Shipley MJ, Jarrett RJ, Breeze E, Marmot MG, Davey Smith G. Obesity and overweight in relation to disease-specific mortality in men with and without existing coronary heart disease in London: the original Whitehall study. Heart 2006;92:886-892. 2. Batty GD, Shipley MJ, Jarrett RJ, Breeze E, Marmot MG, Davey Smith G. Obesity and overweight in relation to organ-specific cancer mortality in London (UK): findings from the original Whitehall study. Int J Obes (Lond) 2005;29:1267-1274. 3. Calle EE, Thun MJ, Petrelli JM, Rodriguez C, Heath CW, Jr. Body-mass index and mortality in a prospective cohort of U.S. adults. N Engl J Med 1999;341:1097-1105. 4. Calle EE, Rodriguez C, Walker-Thurmond K, Thun MJ. Overweight, obesity, and mortality from cancer in a prospectively studied cohort of U.S. adults. N Engl J Med 2003;348:1625-1638. 5. Hodge AM, Dowse GK, Collins VR, Zimmet PZ. Mortality in Micronesian Nauruans and Melanesian and Indian Fijians is not associated with obesity. Am J Epidemiol 1996;143:442-455. 6. Zoppini G, Verlato G, Leuzinger C, Zamboni C, Brun E, Bonora E, Muggeo M. Body mass index and the risk of mortality in type II diabetic patients from Verona. Int J Obes Relat Metab Disord 2003;27:281-285. 7. Pettitt DJ, Lisse JR, Knowler WC, Bennett PH. Mortality as a function of obesity and diabetes mellitus. Am J Epidemiol 1982;115:359-366. 8. Wedick NM, Barrett-Connor E, Knoke JD, Wingard DL. The relationship between weight loss and all-cause mortality in older men and women with and without diabetes mellitus: the Rancho Bernardo study. J Am Geriatr Soc 2002;50:1810-1815. 9. Church TS, Cheng YJ, Earnest CP, Barlow CE, Gibbons LW, Priest EL, Blair SN. Exercise capacity and body composition as predictors of mortality among men with diabetes. Diabetes Care 2004;27:83-88. 10. Hu G, Jousilahti P, Barengo NC, Qiao Q, Lakka TA, Tuomilehto J. Physical activity, cardiovascular risk factors, and mortality among Finnish adults with diabetes.
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