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Soymilk supplementation does not alter plasma markers of inflammation and oxidative stress in postmenopausal women

Beavers, Kristen M and Serra, Monica and Beavers, Daniel P and Cooke, Matthew B and Willoughby, Darryn (2009) Soymilk supplementation does not alter plasma markers of inflammation and oxidative stress in postmenopausal women. Nutrition Research, 29 (9). pp. 616-622. ISSN 0271-5317

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Abstract

Aging is associated with increasing levels of systemic inflammation and oxidative stress, both of which contribute to the progression of cardiovascular disease. Attenuation of such processes via dietary intervention has significant public health implications. Soyfoods, as a source of highquality protein and isoflavones, may improve such indices, although such effects in healthy aging women are not well delineated. The purpose of this study was to test the hypothesis that 4 weeks of daily soymilk consumption would improve systemic markers of inflammation and oxidative stress in postmenopausal women when compared with a dairy control. In September 2009, a single-blind, randomized, controlled trial was conducted on 31 postmenopausal women at Baylor University, Waco, Tex. Subjects were randomly assigned to consume 3 servings of vanilla soy (n = 16) or reduced fat dairy (n = 15) milk per day for 4 weeks. Plasma markers of inflammation (tumor necrosis factor α [TNF-α], interleukin [IL]-1β, IL-6) and oxidative stress (superoxide dismutase [SOD], glutathione peroxidase [GPx], cyclooxygenase-2 [COX-2]) were obtained before and after supplementation. No significant differences were observed for any of the plasma inflammatory (TNF-α, P = .08; IL-1β, P = .14; IL-6, P = .26) or oxidative stress (SOD, P = .68; GPx, P = .58; COX-2, P = .99) variables by dietary treatment group. Despite good dietary compliance, our study failed to show a significant effect of soymilk consumption on markers of inflammation and oxidative stress in this postmenopausal female population. Potential reasons for this nonsignificant finding are discussed, and future research directions are presented.

Item Type: Article
Uncontrolled Keywords: ResPubID21804. aging, inflammation, oxidative stress, soy, soymilk supplementation, plasma markers, menopausal women, menopause, females
Subjects: Faculty/School/Research Centre/Department > School of Biomedical and Health Sciences
FOR Classification > 1111 Nutrition and Dietetics
Depositing User: VUIR
Date Deposited: 26 Oct 2011 04:28
Last Modified: 27 Jan 2015 22:53
URI: http://vuir.vu.edu.au/id/eprint/7541
DOI: 10.1016/j.nutres.2009.09.002
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Citations in Scopus: 16 - View on Scopus

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