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Open Access Highly Accessed Research

Impact of dairy consumption on essential hypertension: a clinical study

Jean-Philippe Drouin-Chartier1, Iris Gigleux1, André J Tremblay1, Luc Poirier2, Benoît Lamarche1 and Patrick Couture12*

Author Affiliations

1 Institute of Nutrition and Functional Foods (INAF), Pavillon des Services, Laval University, 2440, Hochelaga Blvd, Quebec City G1V 0A6, Canada

2 CHUQ Research Center, Laval University, Quebec City, Canada

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Nutrition Journal 2014, 13:83  doi:10.1186/1475-2891-13-83

Published: 14 August 2014

Abstract

Background

Several studies have presented evidence suggesting that dairy consumption has beneficial effects on blood pressure (BP) in healthy subjects; however, only a few studies have examined this possibility in patients with established essential hypertension using ambulatory blood pressure monitoring. The objective of this study was to investigate how consuming dairy products impacts mean daytime systolic and diastolic BP in men and women with mild to moderate essential hypertension.

Methods

Eighty-nine men and women with systolic BP ≥ 135 mm Hg and ≤ 160 mm Hg and diastolic BP ≤ 110 mm Hg were enrolled in this single-blind, randomized, cross-over, controlled study. Participants had to incorporate three daily servings of dairy products or control products equivalent in macronutrients and sodium during four-week treatment phases. Twenty-four hour ambulatory BP and endothelial function were assessed at screening and at the end of each dietary phase.

Results

The consumption of three daily servings of dairy products led to a significant reduction in mean daytime ambulatory systolic BP (-2 mm Hg; P = 0.05) in men compared with readings after the control phase. In women, dairy consumption had no effect on ambulatory systolic BP. Moreover, endothelial function was significantly improved by dairy consumption in the whole cohort.

Conclusion

These data indicate that the consumption of three daily servings of dairy products have beneficial effects on daytime systolic ambulatory BP compared to a heart-healthy, dairy-free, diet in men with mild to moderate essential hypertension.

Trial registration

This trial is registered at clinicaltrials.gov as NCT01776216.

Keywords:
Dairy products; Nutrition; Clinical trial; Essential hypertension; Ambulatory monitoring