Effect of supplemental phytonutrients on impairment of the flow-mediated brachial artery vasoactivity after a single high-fat meal

Gary D. Plotnick, Mary C. Corretti, Robert A. Vogel, Robert Hesslink, John A. Wise

Research output: Contribution to journalArticle

Abstract

OBJECTIVES: Our objective was to determine if long-term daily administration of phytonutrient supplements can prevent the immediate adverse impact of a high-fat meal and increase the production of nitric oxide. BACKGROUND: Ingestion of a high-fat meal impairs flow-mediated vasodilation of the brachial artery for at least 4 h; however, co-ingestion of vitamin antioxidants or a green salad has been shown to prevent this effect. METHODS: Flow-mediated brachial artery reactivity test (BART) both before and 3 h after a 900 calorie 50 g fat meal was evaluated in 38 healthy volunteers (age 36.4 ± 10.1 years). Subjects were randomized to four weeks of daily supplementation with a powdered fruit vegetable juice concentrate (Juice Plus [JP]) along with a complex supplement providing nutritional antioxidants and various herbal extracts (Vineyard [V]), JP alone, or a matching placebo. At three and four weeks, BART was repeated both before and after the high-fat meal. Serum nitrate/nitrite concentrations were measured at baseline and at four weeks. RESULTS: Four weeks of the JP-V combination blunted the detrimental effect of the high-fat meal (-47.5 ± 23.4% at baseline vs. -1.7 ± 9.7% at four weeks [p < 0.05]). Four weeks of JP alone had a similar beneficial effect (-45.1 ± 19.7% at baseline vs. -16.6 ± 10.3% at four weeks [p < 0.05]), whereas there was no substantial effect of the placebo. In the subjects treated with supplements, concentrations of serum nitrate/nitrite increased from 78 ± 39 to 114 ± 62 μm/l (p < 0.02). CONCLUSIONS: Daily ingestion of modest amounts of a fruit/vegetable juice concentrate with or without adjunctive phytonutrient supplementation can reduce the immediate adverse impact of high-fat meals on flow-mediated vasoactivity and increase nitrate/nitrite blood concentration.

Original languageEnglish (US)
Pages (from-to)1744-1749
Number of pages6
JournalJournal of the American College of Cardiology
Volume41
Issue number10
DOIs
StatePublished - May 21 2003

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

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