Effect of soy protein and isoflavones on blood pressure and endothelial cytokines: a 6-month randomized controlled trial among postmenopausal women.

Abstract:

BACKGROUND:Despite data from animal models and observational studies that are generally supportive for the soy/isoflavones lowering blood pressure (BP) and improving vascular function, the current findings from clinical trials are still inconclusive. OBJECTIVES:To examine whether soy protein with isoflavones or isoflavones alone reduce BP and endothelial cytokines, and whether the effects differed by baseline BP level. METHODS:A double-blind randomized, placebo-controlled trial was conducted among 180 postmenopausal Chinese women with mild hyperglycemia. Participants were randomly assigned to one of the three arms to receive either 15 g soy protein and 100 mg isoflavones (Soy group), or 15 g milk protein and 100 mg isoflavones (Iso group), or 15 g milk protein (placebo group) on a daily basis for 6 months. RESULTS:No significant difference was observed in the change and %change of BP and endothelial cytokine levels among the three study groups. However, a subgroup analysis among 130 pre and hypertensive women suggested that soy protein and isoflavones significantly reduced SBP [-4.25%, 95% confidence interval (CI) -7.9 to -0.6%, P = 0.02] and the level of soluble intercellular adhesion molecule (sICAM)-1 (-22.6%, 95% CI -42.8 to -2.3%, P = 0.02) relative to milk protein after 6-month intervention. CONCLUSIONS:: Our 6-month randomized controlled trial in prediabetic postmenopausal women indicated that soy protein and isoflavones had no significant effect on BP and endothelial molecules; however, a favorable reduction on SBP, sICAM-1 and E-selectin was observed among women with initial elevated BP.

journal_name

J Hypertens

journal_title

Journal of hypertension

authors

Liu ZM,Ho SC,Chen YM,Woo J

doi

10.1097/HJH.0b013e32835c0905

subject

Has Abstract

pub_date

2013-02-01 00:00:00

pages

384-92

issue

2

eissn

0263-6352

issn

1473-5598

journal_volume

31

pub_type

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