Yang Liu1, Marie Fanelli Kuczmarski2, Edgar R Miller3, M Berenice Nava4, Alan B Zonderman5, Michele K Evans5, Neil R Powe6, Deidra C Crews7. 1. Division of Nephrology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland. 2. Department of Behavioral Health and Nutrition, University of Delaware, Newark, Delaware. 3. Welch Center for Prevention, Epidemiology and Clinical Research, Johns Hopkins Medical Institutions, Baltimore, Maryland; Division of General Internal Medicine, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland; Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland. 4. Division of Nephrology, Columbia University Medical Center, New York, New York. 5. Laboratory of Epidemiology and Population Sciences, National Institute on Aging, National Institutes of Health, Baltimore, Maryland. 6. Department of Medicine, San Francisco General Hospital and University of California at San Francisco, San Francisco, California. 7. Division of Nephrology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland; Welch Center for Prevention, Epidemiology and Clinical Research, Johns Hopkins Medical Institutions, Baltimore, Maryland. Electronic address: dcrews1@jhmi.edu.
Abstract
OBJECTIVE: Explore the association between following a Dietary Approaches to Stop Hypertension (DASH)-accordant diet and kidney end points among urban adults. DESIGN: Prospective cohort study. SETTING: Healthy Aging in Neighborhoods of Diversity across the Life Span study. SUBJECTS: A total of 1,534 urban dwelling participants of the Healthy Aging in Neighborhoods of Diversity across the Life Span study with a baseline estimated glomerular filtration rate (eGFR) ≥60 mL/minute/1.73 m2. INTERVENTION: DASH diet accordance determined via a score based on nine target nutrients. MAIN OUTCOME MEASURE: Rapid kidney function decline (eGFR decline >3 mL/minute/1.73 m2 per year), incident chronic kidney disease (CKD) (follow-up eGFR <60 mL/minute/1.73 m2), and eGFR decline >25%. RESULTS: Participants' mean age was 48 years, and 59% were African-American. Median DASH score was 1.5 (range, 0-8). Over a median of 5 years, 13.4% experienced rapid eGFR decline, including 15.2% among participants not following a DASH-accordant diet (score ≤1) and 12.0% with higher accordance (score >1) (P = .08). Outcomes varied by hypertension status. In multinomial logistic regression models, following adjustment for sociodemographic and clinical factors, including total energy intake, low DASH diet accordance was associated with rapid eGFR decline among participants with hypertension (risk ratio, 1.68; 95% confidence interval: 1.17-2.42) but not among those without hypertension (risk ratio, 0.83; 95% confidence interval: 0.56-1.24; P interaction .001). There was no statistically significant association between DASH diet accordance and incident CKD or eGFR decline >25%. Results were similar when DASH diet accordance was analyzed in tertiles. CONCLUSIONS: Among urban adults, low accordance to a DASH-type diet was not associated with incident CKD, but was associated with higher risk of rapid eGFR decline among those with hypertension, yet not among those without hypertension. Further study of dietary patterns as a potential target for improving kidney outcomes among high-risk populations is warranted.
OBJECTIVE: Explore the association between following a Dietary Approaches to Stop Hypertension (DASH)-accordant diet and kidney end points among urban adults. DESIGN: Prospective cohort study. SETTING: Healthy Aging in Neighborhoods of Diversity across the Life Span study. SUBJECTS: A total of 1,534 urban dwelling participants of the Healthy Aging in Neighborhoods of Diversity across the Life Span study with a baseline estimated glomerular filtration rate (eGFR) ≥60 mL/minute/1.73 m2. INTERVENTION: DASH diet accordance determined via a score based on nine target nutrients. MAIN OUTCOME MEASURE: Rapid kidney function decline (eGFR decline >3 mL/minute/1.73 m2 per year), incident chronic kidney disease (CKD) (follow-up eGFR <60 mL/minute/1.73 m2), and eGFR decline >25%. RESULTS:Participants' mean age was 48 years, and 59% were African-American. Median DASH score was 1.5 (range, 0-8). Over a median of 5 years, 13.4% experienced rapid eGFR decline, including 15.2% among participants not following a DASH-accordant diet (score ≤1) and 12.0% with higher accordance (score >1) (P = .08). Outcomes varied by hypertension status. In multinomial logistic regression models, following adjustment for sociodemographic and clinical factors, including total energy intake, low DASH diet accordance was associated with rapid eGFR decline among participants with hypertension (risk ratio, 1.68; 95% confidence interval: 1.17-2.42) but not among those without hypertension (risk ratio, 0.83; 95% confidence interval: 0.56-1.24; P interaction .001). There was no statistically significant association between DASH diet accordance and incident CKD or eGFR decline >25%. Results were similar when DASH diet accordance was analyzed in tertiles. CONCLUSIONS: Among urban adults, low accordance to a DASH-type diet was not associated with incident CKD, but was associated with higher risk of rapid eGFR decline among those with hypertension, yet not among those without hypertension. Further study of dietary patterns as a potential target for improving kidney outcomes among high-risk populations is warranted.
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