Obesity and prevalent and incident CKD: The hypertension detection and follow-up program

Background: Obesity is associated with increased single-nephron glomerular filtration rate, which may increase the risk for chronic kidney disease (CKD), especially when combined with hypertension. However, epidemiological data supporting an association between overweight and obesity and risk for CKD currently are limited. Methods: We used data from the Hypertension Detection and Follow-Up Program (HDFP) to test the hypothesis that overweight and obesity are associated with incident CKD in 5,897 hypertensive adults. Serum and spot urine samples were collected at baseline and year 5. CKD is defined as the presence of 1(+) or greater proteinuria on routine urinalysis and/or an estimated glomerular filtration rate less than 60 mL/min/1.73 m(2) (<1.0 mL/s). Results: In HDFP participants without CKD at baseline, the incidence of CKD at year 5 was 28% in the ideal-body-mass-index group, 31% in the overweight group, and 34% in the obese group. After adjustment for all covariates, including diabetes mellitus, mean baseline diastolic blood pressure, and slope of diastolic blood pressure, both baseline overweight (odds ratio [OR], 1.21; 95% confidence interval [CI], 1.05 to 1.41) and obesity (OR, 1.40; 95% Cl, 1.20 to 1.63) were associated with increased odds of incident CKD at year 5. Similar results were noted after exclusion of participants with baseline diabetes mellitus, with both overweight (OR, 1.22; 95% Cl, 1.05 to 1.43) and obesity (OR, 1.38; 95% Cl, 1.17 to 1.63) remaining significantly associated with incident CKD. Conclusion: These results suggest that obese adults with hypertension have an increased risk for CKD.