Higher protein intake is associated with increased risk for incident end-stage renal disease among blacks with diabetes in the Southern Community Cohort Study

Nutr Metab Cardiovasc Dis. 2016 Dec;26(12):1079-1087. doi: 10.1016/j.numecd.2016.07.009. Epub 2016 Jul 21.

Abstract

Background and aims: Diabetes, a risk factor for end-stage renal disease (ESRD), is associated with impaired protein metabolism. We investigated whether protein intake is associated with ESRD and whether the risk is higher among blacks with diabetes.

Methods and results: We conducted a nested case-control study of ESRD within the Southern Community Cohort Study, a prospective study of low-income blacks and whites in the southeastern US (2002-2009). Through 2012, 1057 incident ESRD cases were identified by linkage with the United States Renal Data System and matched to 3198 controls by age, sex, and race. Dietary intakes were assessed from a validated food frequency questionnaire at baseline. Odds ratios (ORs) and 95% confidence intervals (CIs) were computed from logistic regression models that included matching variables, BMI, education, income, hypertension, total energy intake, and percent energy from saturated and polyunsaturated fatty acids. Mean (±SD) daily energy intake from protein was higher among ESRD cases than controls (15.7 ± 3.3 vs. 15.1 ± 3.1%, P < 0.0001). For a 1% increase in percent energy intake from protein, the adjusted ORs (95% CIs) for ESRD were 1.06 (1.02-1.10) for blacks with diabetes, 1.02 (0.98-1.06) for blacks without diabetes, 0.99 (0.90-1.09) for whites with diabetes and 0.94 (0.84-1.06) for whites without diabetes. Protein intake in g/kg/day was also associated with ESRD (4th vs. 1st quartile OR = 1.76; 95% CI: 1.17-2.65).

Conclusion: Our results raise the possibility that among blacks with diabetes, increased dietary protein is associated with increased incidence of ESRD. Studies on how protein intake and metabolism affect ESRD are needed.

Keywords: Blacks; Cohort; Diabetes; ESRD; Protein; Renal disease.

Publication types

  • Comparative Study
  • Multicenter Study
  • Research Support, American Recovery and Reinvestment Act
  • Research Support, Non-U.S. Gov't
  • Research Support, N.I.H., Extramural
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Adult
  • African Americans*
  • Aged
  • Case-Control Studies
  • Databases, Factual
  • Diabetic Nephropathies / diagnosis
  • Diabetic Nephropathies / ethnology*
  • Dietary Proteins / adverse effects*
  • Energy Intake / ethnology
  • European Continental Ancestry Group
  • Feeding Behavior / ethnology
  • Female
  • Health Status Disparities*
  • Humans
  • Incidence
  • Kidney Failure, Chronic / diagnosis
  • Kidney Failure, Chronic / ethnology*
  • Logistic Models
  • Male
  • Middle Aged
  • Odds Ratio
  • Prospective Studies
  • Recommended Dietary Allowances
  • Risk Assessment
  • Risk Factors
  • Surveys and Questionnaires
  • Time Factors
  • United States / epidemiology

Substances

  • Dietary Proteins