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Special Articles |
Stanford Center for Research in Disease Prevention and the Department of Medicine, Stanford University Medical School, Stanford, California 94304
Address all correspondence to: Dr. Doris Tham, Stanford Center for Research in Disease Prevention, Stanford University School of Medicine, 730 Welch Road, Palo Alto, California 94304. E-mail: doris.tham{at}forsythe.stanford.edu
Phytoestrogens represent a family of plant compounds that have been shown to have both estrogenic and antiestrogenic properties. A variety of these plant compounds and their mammalian metabolic products have been identified in various human body fluids and fall under two main categories: isoflavones and lignans. A wide range of commonly consumed foods contain appreciable amounts of these different phytoestrogens. For example, soy and flax products are particularly good sources of isoflavones and lignans, respectively. Accumulating evidence from molecular and cellular biology experiments, animal studies, and, to a limited extent, human clinical trials suggests that phytoestrogens may potentially confer health benefits related to cardiovascular diseases, cancer, osteoporosis, and menopausal symptoms. These potential health benefits are consistent with the epidemiological evidence that rates of heart disease, various cancers, osteoporotic fractures, and menopausal symptoms are more favorable among populations that consume plant-based diets, particularly among cultures with diets that are traditionally high in soy products. The evidence reviewed here will facilitate the identification of what is known in this area, the gaps that exist, and the future research that holds the most potential and promise.
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W. A. Weiger, T. J. Kaptchuk, and D. M. Eisenberg Complementary and Alternative Medicine in Cancer Ann Intern Med, July 15, 2003; 139(2): 152 - 152. [Full Text] [PDF] |
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J. A. Tice, B. Ettinger, K. Ensrud, R. Wallace, T. Blackwell, and S. R. Cummings Phytoestrogen Supplements for the Treatment of Hot Flashes: The Isoflavone Clover Extract (ICE) Study: A Randomized Controlled Trial JAMA, July 9, 2003; 290(2): 207 - 214. [Abstract] [Full Text] [PDF] |
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R. Liew, J. K. Williams, P. Collins, and K. T. MacLeod Soy-Derived Isoflavones Exert Opposing Actions on Guinea Pig Ventricular Myocytes J. Pharmacol. Exp. Ther., March 1, 2003; 304(3): 985 - 993. [Abstract] [Full Text] [PDF] |
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Z.-C. Dang, V. Audinot, S. E. Papapoulos, J. A. Boutin, and C. W. G. M. Lowik Peroxisome Proliferator-activated Receptor gamma (PPARgamma ) as a Molecular Target for the Soy Phytoestrogen Genistein J. Biol. Chem., January 3, 2003; 278(2): 962 - 967. [Abstract] [Full Text] [PDF] |
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S. J Bhathena and M. T Velasquez Beneficial role of dietary phytoestrogens in obesity and diabetes Am. J. Clinical Nutrition, December 1, 2002; 76(6): 1191 - 1201. [Abstract] [Full Text] [PDF] |
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U. A. Kayisli, C. A. H. Aksu, M. Berkkanoglu, and A. Arici Estrogenicity of Isoflavones on Human Endometrial Stromal and Glandular Cells J. Clin. Endocrinol. Metab., December 1, 2002; 87(12): 5539 - 5544. [Abstract] [Full Text] [PDF] |
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K. D. R. Setchell, N. M. Brown, and E. Lydeking-Olsen The Clinical Importance of the Metabolite Equol--A Clue to the Effectiveness of Soy and Its Isoflavones J. Nutr., December 1, 2002; 132(12): 3577 - 3584. [Abstract] [Full Text] [PDF] |
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R. Y. K. Chan, W.-F. Chen, A. Dong, D. Guo, and M.-S. Wong Estrogen-Like Activity of Ginsenoside Rg1 Derived from Panax notoginseng J. Clin. Endocrinol. Metab., August 1, 2002; 87(8): 3691 - 3695. [Abstract] [Full Text] [PDF] |
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K. M. Robertson, L. O'Donnell, E. R. Simpson, and M. E. E. Jones The Phenotype of the Aromatase Knockout Mouse Reveals Dietary Phytoestrogens Impact Significantly on Testis Function Endocrinology, August 1, 2002; 143(8): 2913 - 2921. [Abstract] [Full Text] [PDF] |
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D. E. Frigo, B. N. Duong, L. I. Melnik, L. S. Schief, B. M. Collins-Burow, D. K. Pace, J. A. McLachlan, and M. E. Burow Flavonoid Phytochemicals Regulate Activator Protein-1 Signal Transduction Pathways in Endometrial and Kidney Stable Cell Lines J. Nutr., July 1, 2002; 132(7): 1848 - 1853. [Abstract] [Full Text] [PDF] |
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L. K. Boker, Y. T. Van der Schouw, M. J. J. De Kleijn, P. F. Jacques, D. E. Grobbee, and P. H. M. Peeters Intake of Dietary Phytoestrogens by Dutch Women J. Nutr., June 1, 2002; 132(6): 1319 - 1328. [Abstract] [Full Text] [PDF] |
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G. A. Greendale, G. FitzGerald, M.-H. Huang, B. Sternfeld, E. Gold, T. Seeman, S. Sherman, and M. Sowers Dietary Soy Isoflavones and Bone Mineral Density: Results from the Study of Women's Health Across the Nation Am. J. Epidemiol., April 15, 2002; 155(8): 746 - 754. [Abstract] [Full Text] [PDF] |
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W. S. Branham, S. L. Dial, C. L. Moland, B. S. Hass, R. M. Blair, H. Fang, L. Shi, W. Tong, R. G. Perkins, and D. M. Sheehan Phytoestrogens and Mycoestrogens Bind to the Rat Uterine Estrogen Receptor J. Nutr., April 1, 2002; 132(4): 658 - 664. [Abstract] [Full Text] [PDF] |
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C. L. Van Patten, I. A. Olivotto, G. K. Chambers, K. A. Gelmon, T. G. Hislop, E. Templeton, A. Wattie, and J. C. Prior Effect of Soy Phytoestrogens on Hot Flashes in Postmenopausal Women With Breast Cancer: A Randomized, Controlled Clinical Trial J. Clin. Oncol., March 15, 2002; 20(6): 1449 - 1455. [Abstract] [Full Text] [PDF] |
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R. Marcus, M. Wong, H. Heath III, and J. L. Stock Antiresorptive Treatment of Postmenopausal Osteoporosis: Comparison of Study Designs and Outcomes in Large Clinical Trials with Fracture as an Endpoint Endocr. Rev., February 1, 2002; 23(1): 16 - 37. [Abstract] [Full Text] [PDF] |
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C. D Gardner, K. A Newell, R. Cherin, and W. L Haskell The effect of soy protein with or without isoflavones relative to milk protein on plasma lipids in hypercholesterolemic postmenopausal women Am. J. Clinical Nutrition, April 1, 2001; 73(4): 728 - 735. [Abstract] [Full Text] [PDF] |
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M. E. Burow, S. M. Boue, B. M. Collins-Burow, L. I. Melnik, B. N. Duong, C. H. Carter-Wientjes, S. Li, T. E. Wiese, T. E. Cleveland, and J. A. McLachlan Phytochemical Glyceollins, Isolated from Soy, Mediate Antihormonal Effects through Estrogen Receptor {{alpha}} and {beta} J. Clin. Endocrinol. Metab., April 1, 2001; 86(4): 1750 - 1758. [Abstract] [Full Text] |
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I. d. Tonkelaar, L. Keinan-Boker, P. Vant Veer, C. J. M. Arts, H. Adlercreutz, J. H. H. Thijssen, and P. H. M. Peeters Urinary Phytoestrogens and Postmenopausal Breast Cancer Risk Cancer Epidemiol. Biomarkers Prev., March 1, 2001; 10(3): 223 - 228. [Abstract] [Full Text] |
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K. Hermansen, M. Søndergaard, L. Høie, M. Carstensen, and B. Brock Beneficial Effects of a Soy-Based Dietary Supplement on Lipid Levels and Cardiovascular Risk Markers in Type 2 Diabetic Subjects Diabetes Care, February 1, 2001; 24(2): 228 - 233. [Abstract] [Full Text] |
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S. Tamir, M. Eizenberg, D. Somjen, N. Stern, R. Shelach, A. Kaye, and J. Vaya Estrogenic and Antiproliferative Properties of Glabridin from Licorice in Human Breast Cancer Cells Cancer Res., October 1, 2000; 60(20): 5704 - 5709. [Abstract] [Full Text] |
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S. Lamon-Fava Genistein Activates Apolipoprotein A-I Gene Expression in the Human Hepatoma Cell Line Hep G2 J. Nutr., October 1, 2000; 130(10): 2489 - 2492. [Abstract] [Full Text] |
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A. M. Pino, L. E. Valladares, M. A. Palma, A. M. Mancilla, M. Yáñez, and C. Albala Dietary Isoflavones Affect Sex Hormone-Binding Globulin Levels in Postmenopausal Women J. Clin. Endocrinol. Metab., August 1, 2000; 85(8): 2797 - 2800. [Abstract] [Full Text] |
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A. M. Duncan, B. E. Merz-Demlow, X. Xu, W. R. Phipps, and M. S. Kurzer Premenopausal Equol Excretors Show Plasma Hormone Profiles Associated with Lowered Risk of Breast Cancer Cancer Epidemiol. Biomarkers Prev., June 1, 2000; 9(6): 581 - 586. [Abstract] [Full Text] |
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S. K. Quella, C. L. Loprinzi, D. L. Barton, J. A. Knost, J. A. Sloan, B. I. LaVasseur, D. Swan, K. R. Krupp, K. D. Miller, and P. J. Novotny Evaluation of Soy Phytoestrogens for the Treatment of Hot Flashes in Breast Cancer Survivors: A North Central Cancer Treatment Group Trial J. Clin. Oncol., March 1, 2000; 18(5): 1068 - 1068. [Abstract] [Full Text] [PDF] |
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J. J. Manly, C. A. Merchant, D. M. Jacobs, S. A. Small, K. Bell, M. Ferin, and R. Mayeux Endogenous estrogen levels and Alzheimer's disease among postmenopausal women Neurology, February 22, 2000; 54(4): 833 - 837. [Abstract] [Full Text] [PDF] |
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K. Sudhir and P. A. Komesaroff Cardiovascular Actions of Estrogens in Men J. Clin. Endocrinol. Metab., October 1, 1999; 84(10): 3411 - 3415. [Full Text] [PDF] |
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J. An, C. Tzagarakis-Foster, T. C. Scharschmidt, N. Lomri, and D. C. Leitman Estrogen Receptor beta -Selective Transcriptional Activity and Recruitment of Coregulators by Phytoestrogens J. Biol. Chem., May 18, 2001; 276(21): 17808 - 17814. [Abstract] [Full Text] [PDF] |
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