Dietary protein intake and change in estimated GFR in the Cardiovascular Health Study

Jeannette M. Beasley, Ronit Katz, Michael Shlipak, Dena E. Rifkin, David Siscovick, Robert Kaplan

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

Objective: With aging, kidney function declines, as evidenced by reduced glomerular filtration rate. It is controversial whether or not high protein intake accelerates this decline. The aim of this study was to determine whether high protein intake was associated with declines in kidney function among older patients. Methods: We examined whether dietary protein is associated with change in kidney function (mean follow-up 6.4 y [SD = 1.4, range = 2.5-7.9] in the Cardiovascular Health Study (N = 3623). We estimated protein intake using a food frequency questionnaire and estimated glomerular filtration rate from cystatin C. Associations between protein intake and kidney function were determined by linear and logistic regression models. Results: Average protein intake was 19% of energy intake (SD = 5%). Twenty-seven percent (n = 963) of study participants had rapid decline in kidney function, as defined by (δeGFRcysC > 3 mL•min•1.73 m2). Protein intake (characterized as g/d and % energy/d), was not associated with change in estimated glomerular filtration rate (P > 0.05 for all comparisons). There were also no significant associations when protein intake was separated by source (animal and vegetable). Conclusion: These data suggest that higher protein intake does not have a major effect on kidney function decline among elderly men and women.

Original languageEnglish (US)
Pages (from-to)794-799
Number of pages6
JournalNutrition
Volume30
Issue number7-8
DOIs
StatePublished - Jul 2014

Keywords

  • Animal protein
  • Glomerular filtration rate
  • Kidney
  • Macronutrients
  • Vegetable protein

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Nutrition and Dietetics

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