Effects of acute consumption of a fruit and vegetable purée-based drink on vasodilation and oxidative status

Br J Nutr. 2013 Apr 28;109(8):1442-52. doi: 10.1017/S0007114512003315. Epub 2012 Sep 28.

Abstract

Epidemiological studies indicate that diets rich in fruits and vegetables (F&V) are protective against CVD. Puréed F&V products retain many beneficial components, including flavonoids, carotenoids, vitamin C and dietary fibres. The present study aimed to establish the physiological effects of acute ingestion of a F&V purée-based drink (FVPD) on vasodilation, antioxidant status, phytochemical bioavailability and other CVD risk factors. A total of twenty-four subjects, aged 30-70 years, completed the randomised, single-blind, controlled, crossover test meal study. Subjects consumed 400 ml of the FVPD, or a fruit-flavoured sugar-matched control, after following a low-flavonoid diet for 5 d. Blood and urine samples were collected throughout the study day, and vascular reactivity was assessed at 90 min intervals using laser Doppler iontophoresis. The FVPD significantly increased plasma vitamin C (P= 0·002) and total nitrate/nitrite (P= 0·001) concentrations. There was a near significant time by treatment effect on ex vivo LDL oxidation (P= 0·068), with a longer lag phase after consuming the FVPD. During the 6 h after juice consumption, the antioxidant capacity of plasma increased significantly (P= 0·003) and there was a simultaneous increase in plasma and urinary phenolic metabolites (P< 0·05). There were significantly lower glucose and insulin peaks after ingestion of the FVPD compared with control (P= 0·019 and 0·003) and a trend towards increased endothelium-dependent vasodilation following FVPD consumption (P= 0·061). Overall, FVPD consumption significantly increased plasma vitamin C and total nitrate/nitrite concentrations, with a trend towards increased endothelium-dependent vasodilation. Puréed F&V products are useful vehicles for increasing micronutrient status, plasma antioxidant capacity and in vivo NO generation, which may contribute to CVD risk reduction.

Publication types

  • Comparative Study
  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Analysis of Variance
  • Ascorbic Acid / metabolism*
  • Beverages
  • Carotenoids / metabolism*
  • Cross-Over Studies
  • Female
  • Flavonoids / blood
  • Flavonoids / metabolism*
  • Fruit*
  • Glucose / analysis
  • Humans
  • Insulin / blood
  • Iontophoresis
  • Male
  • Middle Aged
  • Oxidative Stress / physiology*
  • Single-Blind Method
  • Uric Acid / blood
  • Vasodilation / physiology*
  • Vegetables*

Substances

  • Flavonoids
  • Insulin
  • Uric Acid
  • Carotenoids
  • Glucose
  • Ascorbic Acid