Clinical and metabolic response to soy administration in older women with metabolic syndrome: a randomized controlled trial

Afsaneh Bakhtiari; Karimollah Hajian-Tilaki; Shabnam Omidvar; Fatemeh Nasiri-Amiri

doi:10.1186/s13098-019-0441-y

Clinical and metabolic response to soy administration in older women with metabolic syndrome: a randomized controlled trial

Diabetol Metab Syndr. 2019 Jun 20:11:47. doi: 10.1186/s13098-019-0441-y. eCollection 2019.

Authors

Afsaneh Bakhtiari^{1

2}, Karimollah Hajian-Tilaki³, Shabnam Omidvar^{4

2}, Fatemeh Nasiri-Amiri^{5

2}

Affiliations

¹ 1Mobility Impairment Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran.
² 5Department of Midwifery, Faculty of Nursing and Midwifery, Babol University of Medical Sciences, Babol, Iran.
³ 2Department of Biostatistics and Epidemiology, Faculty of Medicine, Babol University of Medical Sciences, Babol, Iran.
⁴ 3Social Determinants of Health Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran.
⁵ 4Infertility and Health Reproductive Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran.

Abstract

Background: There are many studies on the health effects of soy, only a few describe the effects of the simultaneous use of two types of soy on multiple components of metabolic syndrome (MetS). The present study was designed to determine the effects of roasted soy-nut and textured soy protein (TSP) intake on clinical and metabolic status of older women with MetS borderline parameters.

Method: This randomized, single-blind, controlled clinical trial included 75 women ≥ 60 years old with a diagnosis of MetS based on ATP III criteria. The participants were randomly allocated into three groups of 25 people; soy-nut, TSP and control groups for 12 week. Fasting blood samples were taken at the beginning and end of the trial to compare the metabolic responses. All participants provided three dietary records and physical activity records during the intervention. We used the Kolmogorov-Smirnov, ANOVA, ANCOVA, paired-t test, and the Generalized Linear Model (GLM) repeated measures analysis.

Results: Dietary intake and physical activity of the participants in two groups were not significantly different. After 12 weeks of intervention the participants who received soy-nut had a significant decrease in total cholesterol (TC) (p < 0.001), low density lipoprotein, very low density lipoprotein, apolipoprotein B100, fasting blood glucose, insulin (p < 0.05), HOMA-IR, malondialdehyde (MDA) (p < 0.01) level. Morever, a significant increase in total antioxidant capacity (TAC) (p < 0.01) level compared with the control group. At the same time, the TSP brought significant decrease only in TC, insulin, MDA (p < 0.05) level and a significant increase in total TAC (p < 0.05) level. We did not find any significant effect in intervention groups, on apolipoprotein AI, triglyceride (TG), high density lipoprotein (HDL-C), TG/HDL, C-reactive protein and fibrinogen levels after intervention.

Conclusion: Short-term intakes of roasted soy-nut and TSP have shown to improve the lipid profiles, markers of glucose intolerance and oxidative stress; although the roasted soy-nut was more effective than TSP. Therefore, a moderate daily intake of roasted soy-nut as snacks or TSP as a meal complement by individuals with borderline parameters of MetS can be a safe and a practical modality to avoid the progression of the disease as well as to limit the side effects of drug intake.Trial registration MUBABOL.REC.1388.1.

Keywords: Elderly women; Metabolic syndrome; Soy protein; Soy-nut.