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Dietary cocoa flavanols improve blood vessel function in patients with kidney dysfunction

Date:
December 18, 2015
Source:
American Society of Nephrology (ASN)
Summary:
Individuals with failing kidneys are at increased risk of developing heart problems, and they're more likely to die from cardiovascular causes than from any other cause. Now investigators suggest that ingesting a drink rich in cocoa flavanols improved blood vessel function and reduced diastolic blood pressure in patients with kidney failure.
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Consuming a beverage containing cocoa flavanols improves blood vessel function in patients with kidney failure, according to a study appearing in an upcoming issue of the Clinical Journal of the American Society of Nephrology (CJASN). The findings suggest that the plant-derived compounds may benefit the cardiovascular health of patients with poor kidney function.

Individuals with failing kidneys are at increased risk of developing heart problems, and they're more likely to die from cardiovascular causes than from any other cause. Lifestyle and dietary modifications to maintain vascular health or reduce disease risk might help protect patients' heart health, but there are currently limited diet-based therapeutic approaches to counteract cardiovascular disease in patients with kidney failure.

Tienush Rassaf, MD (University Hospital Essen, Germany) and his colleagues tested the potential of cocoa flavanols, a subgroup of plant-derived polyphenols that are present in cocoa and have been shown to have beneficial effects on blood vessel function in individuals with normal kidney function.

The team randomized 57 dialysis patients to ingest either a test beverage rich in cocoa flavanols (900 mg per day) or a control beverage that was free of cocoa flavanols but matched the nutrient content of the test beverage in all other aspects. After 30 days, the investigators found that cocoa flavanol ingestion was well-tolerated by patients and it improved blood vessel function and reduced diastolic blood pressure. No effects were observed in the group that consumed the control beverage.

"Impressively, the degree of reversion of vessel dysfunction was comparable to the effects observed through administering statins or making dietary and lifestyle changes," said Dr. Rassaf. "Whether this approach also leads to a reduction in mortality is not clear and has to be investigated."

In an accompanying editorial, Carmine Zoccali, MD and Francesca Mallamaci, MD (CNR-IFC, in Italy) noted that "the burden of cardiovascular disease in dialysis patients is so devastating that a promising intervention like cocoa flavanols deserves full attention by the nephrology community." They added that if the findings are confirmed in additional studies, they may represent a turning point in patient care.


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Materials provided by American Society of Nephrology (ASN). Note: Content may be edited for style and length.


Journal References:

  1. C. Zoccali, F. Mallamaci. Cocoa Flavanols: A Magic Potion for Protecting the Endothelium in Kidney Failure? Clinical Journal of the American Society of Nephrology, 2015; DOI: 10.2215/CJN.12141115
  2. T. Rassaf, C. Rammos, U. B. Hendgen-Cotta, C. Heiss, W. Kleophas, F. Dellanna, J. Floege, G. R. Hetzel, M. Kelm. Vasculoprotective Effects of Dietary Cocoa Flavanols in Patients on Hemodialysis: A Double-Blind, Randomized, Placebo-Controlled Trial. Clinical Journal of the American Society of Nephrology, 2015; DOI: 10.2215/CJN.05560515

Cite This Page:

American Society of Nephrology (ASN). "Dietary cocoa flavanols improve blood vessel function in patients with kidney dysfunction." ScienceDaily. ScienceDaily, 18 December 2015. <www.sciencedaily.com/releases/2015/12/151218090224.htm>.
American Society of Nephrology (ASN). (2015, December 18). Dietary cocoa flavanols improve blood vessel function in patients with kidney dysfunction. ScienceDaily. Retrieved May 26, 2017 from www.sciencedaily.com/releases/2015/12/151218090224.htm
American Society of Nephrology (ASN). "Dietary cocoa flavanols improve blood vessel function in patients with kidney dysfunction." ScienceDaily. www.sciencedaily.com/releases/2015/12/151218090224.htm (accessed May 26, 2017).

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