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Obesity does not accelerate the decline in glomerular filtration rate associated with advancing age

International Journal of Obesity volume 33, pages 379–381 (2009)Cite this article

Abstract

Obesity has been suggested as a risk factor for chronic kidney disease. However, it has also been suggested that the association between obesity and impaired glomerular filtration rate (GFR) arises from the invalid use of body surface area (BSA) for scaling. This study assesses the effect of obesity on GFR by comparing the age-dependent decline in obese (body mass index (BMI) >30 kg/m2; n=149) and non-obese patients (n=589), aged >30 years, referred for measurement of GFR (Cr-51-EDTA and three blood samples). GFR was scaled to a BSA of 1.73 m2 (GFR/BSA) and extracellular fluid volume of 13 l (GFR/ECV), both corrected for the one-compartment assumption. When non-obese patients were categorized into 10-year age brackets (from 31 to >70), GFR/BSA and GFR/ECV declined from 92 ml per min per 1.73 m2 and 95 ml per min per 13 l, respectively, at 31–40 years to 58 and 59 at >70. The declines in obese patients were similar with corresponding values of 88 ml per min per 1.73 m2 and 97 ml per min per 13 l at 31–40 and 57 and 59 at >70 years. Linear regression analysis of non-categorized data from age 40 years showed rates of decline slightly slower in the obese (0.82 vs 0.95 ml per min per 1.73 m2 per year and 0.87 vs 1.02 ml per min per 13 l per year). No effect of obesity on renal function was shown. Scaling to BSA did not distort the results.

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Authors and Affiliations

  1. Brighton Sussex Medical School, Brighton, UK

    A M Peters, M B Ciapryna & P F Bowles

  2. Department of Nuclear Medicine, Harley Street Clinic, London, UK

    A M Peters & D M Glass

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  1. A M Peters
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  2. M B Ciapryna
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  3. P F Bowles
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  4. D M Glass
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Correspondence to A M Peters.

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Peters, A., Ciapryna, M., Bowles, P. et al. Obesity does not accelerate the decline in glomerular filtration rate associated with advancing age. Int J Obes 33, 379–381 (2009). https://doi.org/10.1038/ijo.2009.6

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