title: Natural antioxidants from tomato extract reduce blood pressure in patients with grade-1 hypertension: a double-blind, placebo-controlled pilot study.
abstract: BACKGROUND
  Treatment of hypertension (HT) can reduce the risk for cardiovascular diseases. Tomato extract contains carotenoids such as lycopene, beta carotene, and vitamin E, which are known as effective antioxidants, to inactivate free radicals, and to slow the progression of atherosclerosis. The purpose of our study was to evaluate the effect of tomato extract on systolic and diastolic blood pressure in grade-1 HT, on serum lipoproteins, plasma homocysteine, and oxidative stress markers.
  
  
  METHODS
  This study is a single-blind, placebo-controlled trial. Thirty-one subject with grade-1 HT, without concomitant diseases, who required no antihypertensive or lipid-lowering drug therapy, who were recruited from primary care clinics, completed the trial. Subjects entered a 4-week placebo period, then an 8-week treatment period with tomato extract, 250 mg Lyc-O-Mato, and a 4-week control period with placebo.
  
  
  RESULTS
  Systolic blood pressure decreased from 144 (SE +/- 1.1) to 134 mm Hg (SE +/- 2, P < .001), and diastolic blood pressure decreased from 87.4 (SE +/- 1.2) to 83.4 mm Hg (SE +/- 1.2, P < .05). No changes in blood pressure were demonstrated during placebo periods. Thiobarbituric acid-reactive substances, a lipid peroxidation products marker, decreased from 4.58 (SE +/- 0.27) to 3.81 nmol/mg (SE +/- 0.32, P < .05). No significant changes were found in lipid parameters.
  
  
  CONCLUSIONS
  A short-term treatment with antioxidant-rich tomato extract can reduce blood pressure in patients with grade-1 HT, naive to drug therapy. The continuous effect of this treatment and the long-term beneficial effect on cardiovascular risk factors still need to be demonstrated.
authors.affiliation: Hypertension Unit, Faculty of Health Sciences, Soroka University Medical Centre, Ben Gurion, University of the Negev, 84101 Beer Sheva, Israel.
authors.forename: Yechiel N
authors.initials: YN
authors.lastname: Engelhard
authors.forename: Benny
authors.initials: B
authors.lastname: Gazer
authors.forename: Esther
authors.initials: E
authors.lastname: Paran
mesh_terms: D000328:Adult; D000368:Aged; D000975:Antioxidants / Q000627:therapeutic use*; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D006973:Hypertension / Q000188:drug therapy*; D018551:Solanum lycopersicum; D008297:Male; D008875:Middle Aged; D008517:Phytotherapy; D010865:Pilot Projects; D010936:Plant Extracts / Q000627:therapeutic use; D016037:Single-Blind Method
chemical_list: D000975:Antioxidants; D010936:Plant Extracts