期刊
AMERICAN JOURNAL OF CLINICAL NUTRITION
卷 88, 期 2, 页码 298-304出版社
OXFORD UNIV PRESS
DOI: 10.1093/ajcn/88.2.298
关键词
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资金
- Australian Research Council Linkage Grant [LP0349193]
- Australian Research Council [LP0349193] Funding Source: Australian Research Council
Background: Health claims link soy protein (SP) consumption, through plasma cholesterol reduction, to a decreased risk of heart disease. Soy isoflavones (ISOs), particularly in individuals who produce equol, might also contribute to lipid lowering and thus reduce SP requirements. Objective: The objective was to examine the contributions of SP, ISOs, and equol to the hypocholesterolemic effects of soy foods. Design: Nonsoy consumers (33 men, 58 women) with a plasma total cholesterol (TChol) concentration >5.5 mmol/L participated in a double-blind, placebo-controlled, crossover intervention trial. The subjects consumed 3 diets for 6 wk each in random order, which consisted of foods providing a daily dose of 1) 24g SP and 70-80mg ISOs (diet S); 2) 12 g SP, 12 g dairy protein (DP), and 70-80 mg ISOs (diet SD); and 3) 24g DP without ISOs (diet D). Fasting plasma TChol, LDL cholesterol, HDL cholesterol, and triglycerides (TGs) were measured after each diet. Results: TChol was 3% lower with the S diet (-0.17 +/- 0.06 mmol/L; P <0.05) than with the D diet, and TG were 4% lower with both the S (-0.14 +/- 0.05 mmol/L; P < 0.05) and SD (-0.12 +/- 0.05 mmol/L; P < 0.05) diets. There were no significant effects on LDL cholesterol, HDL cholesterol, or the TChol: HDL cholesterol ratio. On the basis of urinary ISOs, 30 subjects were equol producers. Lipids were not affected significantly by equol production. Conclusions: Regular consumption of foods providing 24 g SP/d from ISOs had no significant effect on plasma LDL cholesterol in mildly hypercholesterolemic subjects, regardless of equol-producing status.
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