Beetroot juice improves in overweight and slightly obese men postprandial endothelial function after consumption of a mixed meal

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Abstract

BACKGROUND: Through effects on nitric oxide (NO) bioavailability, endothelial function is improved after the intake of beetroot juice-which is rich in inorganic nitrate-, but decreased after the intake of a meal. OBJECTIVE: The objective of this study was to examine if beetroot juice could counteract the impairment of endothelial function associated with the ingestion of a mixed meal. METHODS: Twenty healthy overweight and slightly obese men with a BMI between 28 and 35 kg/m(2) received in random order a mixed meal providing 56.6 g of fat with beetroot juice or a control drink. The beetroot juice (140 mL) provided approximately 500 mg dietary nitrate. Flow-mediated dilation (FMD) of the brachial artery was measured before and 2 h after meal consumption. Blood was sampled at regular intervals. RESULTS: Postprandial changes in serum triacylglycerol (TAG) (P = 0.69), plasma glucose (P = 0.84) and insulin (P = 0.67) concentrations were comparable between the meals. After consumption of beetroot juice, the postprandial impairment in FMD following a standardized mixed meal was improved (P = 0.030) compared with the control drink (-0.37 +/- 2.92% versus -1.56 +/- 2.90%). Following beetroot juice consumption, plasma concentrations of the circulating NO pool were higher at T60, T120, and T240 (P < 0.001 at all time points). CONCLUSION: In healthy overweight and slightly obese men a single dose of beetroot juice attenuates the postprandial impairment of FMD following a mixed meal, possibly through increases in plasma NO concentrations.
Original languageEnglish
Pages (from-to)78-83
Number of pages6
JournalAtherosclerosis
Volume231
Issue number1
DOIs
Publication statusPublished - Nov 2013

Keywords

  • Beetroot juice
  • Inorganic nitrate
  • Endothelial dysfunction
  • Flow-mediated dilation
  • Postprandial lipemia
  • HIGH-FAT MEAL
  • HEALTHY-MEN
  • DEPENDENT VASODILATION
  • INORGANIC NITRATE
  • BRACHIAL-ARTERY
  • NITRIC-OXIDE
  • PERIPHERAL VASODILATION
  • DIETARY NITRATE
  • BLOOD-PRESSURE
  • HUMANS

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