Original Article
European Journal of Clinical Nutrition (2007) 61, 786–795; doi:10.1038/sj.ejcn.1602562; published online 6 December 2006
Effects of consuming foods containing oat 
-glucan on blood pressure, carbohydrate metabolism and biomarkers of oxidative stress in men and women with elevated blood pressure
K C Maki1,2, R Galant1, P Samuel3, J Tesser4, M S Witchger1, J D Ribaya-Mercado5, J B Blumberg5 and J Geohas1
- 1Radiant Research, Chicago, IL, USA
- 2Provident Clinical Research, Bloomington, IN, USA
- 3The Quaker Oats Company, Barrington, Il, USA
- 4Radiant, Research, Phoenix North, Phoenix, AZ, USA
- 5Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA, USA
Correspondence: Dr KC Maki, Provident Clinical Research, 903 South President Street, Wheaton, IL 60187, USA. E-mail: kmaki@providentcrc.com
Received 26 October 2005; Revised 28 June 2006; Accepted 14 August 2006; Published online 6 December 2006.
Abstract
Objective:
To assess the effects of consuming foods containing oat 
-glucan on blood pressure, carbohydrate homeostasis and biomarkers of oxidative stress.
Design:
A randomized, double-blind, controlled clinical trial.
Setting:
The trial was conducted at two clinics.
Subjects and interventions:
Ninety-seven men and women with resting systolic blood pressure 130–179 mm Hg and/or diastolic blood pressure 85–109 mm Hg were randomly assigned to consume foods containing oat -glucan or control foods for 12 weeks. Resting blood pressures, insulin and glucose values before and after standard breakfast meals, and four biomarkers of oxidative stress were measured before and at the end of the treatment period.
Results:
Changes from baseline to week 12 in mean peak insulin and incremental area under the insulin curve differed significantly between groups (P=0.037 and 0.034, respectively), with the -glucan group showing declines and the control group remaining essentially unchanged. Blood pressure responses were not significantly different between groups overall. However, in subjects with body mass index above the median (31.5 kg/m2), both systolic (8.3 mm Hg, P=0.008) and diastolic (3.9 mm Hg, P=0.018) blood pressures were lowered in the -glucan group compared to controls. No significant differences in biomarkers of oxidative stress were observed between treatments.
Conclusions:
The results of the present trial suggest beneficial effects of foods containing -glucan from oats on carbohydrate metabolism, and on blood pressure in obese subjects.
Sponsorship:
Funding for this study was provided by the Quaker Oats Company.
Keywords:
blood pressure, insulin, oats, -glucan, oxidative stress
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