Abstract
Background/Objectives:
Telomere shortening is associated with age and risk of medical comorbidity. We assessed the relationship between measures of adiposity, leukocyte telomere length, and mortality and whether it is modified by age.
Subjects/Methods:
Subjects with dual-energy X-ray absorptiometry measures were identified using the National Health and Nutrition Examination Survey 1999–2002. Obesity was categorized using two body fat definitions (BF1%: men ⩾25%; females ⩾35%; BF2% ⩾28% and ⩾38%, respectively), body mass index (BMI) and waist circumference (WC; men ⩾102 cm; females ⩾88 cm). Telomere length relative to standard reference DNA (T/S ratio) was assessed using quantitative PCR. Weighted multivariable regression models evaluated the association of telomere length with adiposity, both continuously and categorically (low/normal BF%, low/high WC and standard BMI categories). Differences in telomere length by age and adiposity were ascertained and subsequent models were stratified by age. Proportional hazard models assessed the risk of mortality by adiposity status. A telomere by adiposity interaction was tested in the entire cohort and by age category (<60 vs ⩾60 years; <70 vs ⩾70 years).
Results:
We identified 7827 subjects. Mean age was 46.1 years. Overall telomere length was 1.05±0.01 (s.e.) that differed by BF1% (low/high: 1.12±0.02 vs 1.03±0.02; P<0.001), BF2% (1.02±0.02 vs 1.11±0.02; P<0.001), BMI (underweight 1.08±0.03; normal 1.09±0.02; overweight 1.04±0.02; and obese 1.03±0.02;P<0.001) and WC (low/high 1.09±0.02 vs 1.02±0.02; P<0.001). Adjusted β-coefficients evaluating the relationship between telomere length and adiposity (measured continuously) were as follows: BF1% (β=−0.0033±0.0008; P<0.001), BF2% (−0.041±0.008; P<0.001), BMI (β=−0.025±0.0008; P=0.005) and WC (β=−0.0011±0.0004; P=0.007). High BF% (BF1%: β=−0.035±0.011; P=0.002; BF2%: β=−0.041±0.008; P<0.001) and WC (β=−0.035±0.011; P=0.008) were inversely related to telomere length (TL). Stratifying by age, high BF1% (−0.061±0.013), BF2% (−0.065±0.01), BMI-obesity (−0.07±0.015) and high WC (−0.048±0.013) were significant (all P<0.001). This association diminished with increasing age. In older participants, TL was inversely related to mortality (hazard ratio 0.36 (0.27, 0.49)), as were those classified by BF1% (0.68 (0.56, 0.81)), BF2% (0.75 (0.65, 0.80)), BMI (0.50 (0.42, 0.60)) and WC (0.72 (0.63, 0.83)). No interaction was observed between adiposity status, telomere length and mortality.
Conclusions:
Obesity is associated with shorter telomere length in young participants, a relationship that diminishes with increasing age. It does not moderate the relationship with mortality.
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Acknowledgements
JAB’s research reported in this publication was supported in part by the National Institute on Aging of the National Institutes of Health under Award Number K23AG051681. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health. Support was also provided by the Dartmouth Health Promotion and Disease Prevention Research Center supported by Cooperative Agreement Number U48DP005018 from the Centers for Disease Control and Prevention. The findings and conclusions in this journal article are those of the authors and do not necessarily represent the official position of the Centers for Disease Control and Prevention. JAB received funding from Health Resources Services Administration (UB4HP19206-01-00) for medical geriatric teaching, the Junior Faculty Career Development Award, the Department of Medicine, Dartmouth-Hitchcock Medical Center, and the Dartmouth Centers for Health and Aging. SJB receives funding from the National Institute of Mental Health (K12 HS0217695 (AHRQ); NIMH: T32 MH073553, R01 MH078052, R01 MH089811; R24 MH102794 CDC U48DP005018). RTE is supported by The Dartmouth Clinical and Translational Science Institute, under award number UL1TR001086 from the National Center for Advancing Translational Sciences (NCATS) of the National Institutes of Health (NIH).
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Work to be presented in part to the 2017 International Association of Geriatrics and Gerontology, San Francisco, CA, USA, July 2017.
Supplementary Information accompanies this paper on International Journal of Obesity website
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Batsis, J., Mackenzie, T., Vasquez, E. et al. Association of adiposity, telomere length and mortality: data from the NHANES 1999–2002. Int J Obes 42, 198–204 (2018). https://doi.org/10.1038/ijo.2017.202
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DOI: https://doi.org/10.1038/ijo.2017.202
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