Impact of westernization on fibroblast growth factor 23 levels among individuals of African ancestry Journal Article

Authors: Eckberg, K.; Kramer, H; Wolf, M.; Durazo-Arvizu, R; Tayo, B; Luke, A; Cooper, R
Article Title: Impact of westernization on fibroblast growth factor 23 levels among individuals of African ancestry
Abstract: INTRODUCTION: The Western diet is associated with high consumption of processed foods preserved with phosphate. Higher dietary phosphate consumption stimulates production of fibroblast growth factor 23 (FGF23), which heightens risk for cardiovascular disease and mortality. We hypothesized that adults living in a more westernized society have higher levels of FGF23 due to increased phosphate consumption as measured by urinary phosphate excretion. METHODS: We measured plasma C-terminal FGF23 levels and urinary phosphate and creatinine levels in timed urine collections among 100 African adults living in the rural area of Igbo-Ora, Nigeria (52 women, 48 men), and 100 African Americans (32 women, 68 men) living in Maywood, IL, an urban suburb of Chicago, IL, USA. Among these 200 participants, urine collections were adequate in 76 and 68 of the Maywood and Igbo-Ora participants, respectively. RESULTS: In the total group, the mean age and body mass index, respectively, were 34.6 +/- 8.2 years and 22.1 +/- 3.9 kg/m2 in Igbo-Ora, and 42.8 +/- 7.2 years and 25.8 +/- 6.5 kg/m2 in Maywood. Demographic characteristics for each site were very similar after excluding participants without adequate urine collections. Among all 200 participants, the median (interquartile range) FGF23 levels were significantly higher in Maywood versus Igbo-Ora [63.8 (45.0-89.9) versus 12.5 RU/mL (8.5-18.5); P 400 RU/mL or after excluding participants with inadequate urine collections. Among participants with adequate urine collections, the mean 24-h urinary phosphate excretion was significantly higher in Maywood versus Igbo-Ora (810.6 +/- 309.0 versus 347.5 +/- 153.1 mg; P 0.001) and FGF23 levels correlated significantly with total urinary phosphate excretion (r = 0.62; P 0.001) and urinary phosphate-to-creatinine ratios (r = 0.50; P 0.001). CONCLUSIONS: Living in a more westernized society may be associated with greater net phosphate absorption, as reflected by higher urinary phosphate excretion, and higher FGF23 levels.
Journal Title: Nephrology, dialysis, transplantation : official publication of the European Dialysis and Transplant Association - European Renal Association
Volume: 30
Issue: 4
ISSN: 1460-2385; 0931-0509
Publisher: . Published by Oxford University Press on behalf of ERA-EDTA  
Date Published: 2015
Start Page: 630
End Page: 635
Language: ENG
Notes: LR: 20141102; CI: (c) The Author 2014; JID: 8706402; OTO: NOTNLM; aheadofprint
LUC Authors
  1. Amy Luke
    66 Luke
  2. Holly Kramer
    67 Kramer
  3. Bamidele Olusegun Tayo
    88 Tayo
  4. Richard Stanley Cooper
    115 Cooper
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