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Biofactors. 2000;12(1-4):251-7.

The effects of soy protein in women and men with elevated plasma lipids.

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  • 1Sydney Menopause Centre, Royal Hospital for Women, Randwick, NSW, Australia.


Fifty four postmenopausal women with elevated cholesterol were recruited for a randomised, double-blind controlled trial of soy protein containing isoflavones. (ISP+) or a soy protein with a low isoflavone content (ISP-), taken daily for 12 weeks. There was an overall reduction after 12 weeks in total cholesterol (TC), LDL cholesterol (LDL-C), sex hormone binding globulin (SHBG), and luteinizing hormone (LH). There were no significant differences between treatment groups. In a separate study 27 male subjects with a TC > 5.5 mmol/l were given ISP+ for 12 weeks. In this male study there was a significant increase in HDL cholesterol (HDL-C) and SHBG. Soy protein has a cholesterol lowering effect in both women and men. These studies suggest that this effect is independent of isoflavones. Soy protein also reduces SHBG levels in both sexes.

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