Phytoestrogens May Help Reduce Breast Cancer Risk, New Study Suggests

According to a recent study published in the Journal of the American Nutrition Association, researchers at Wroclaw Medical University in Poland have found that phytoestrogens, found in foods such as soy products and flaxseed, may help reduce the risk of breast cancer in postmenopausal women. The study, titled "Comprehensive Review of Isoflavones and Lignans in the Prophylaxis and Treatment of Breast Cancer," discusses the potential benefits of phytoestrogens in breast cancer prevention and treatment. Phytoestrogens are capable of binding to estrogen receptors and can act as either estrogen agonists or antagonists, influencing the risk of breast cancer.

Key Takeaways:

• Breast cancer is the second most commonly diagnosed cancer worldwide, with the highest mortality rate among all cancers.
• Phytoestrogens, found in foods such as soy products and flaxseed, may help reduce the risk of breast cancer in postmenopausal women.
• Phytoestrogens can reduce the risk of breast cancer incidence and recurrence, but the reasons for this are not yet fully understood.
• Phytoestrogens may be used in breast cancer prevention to lower the risk of breast cancer.
• Isoflavones, found in soy products, and lignans, found in flaxseed, are two prominent representatives of phytoestrogens that may be effective in breast cancer prevention.
• Phytoestrogens may influence estrogen metabolism, sex hormone concentrations, and menstrual cycle length, but these effects are not observed in every consumer.
• The metabolism of phytoestrogens is influenced by intestinal microbiota, with certain bacterial strains capable of metabolizing phytoestrogens.

Statistics:

• Breast cancer is the second most commonly diagnosed cancer worldwide.
• Phytoestrogens are found in plants in glycoside form (bound with sugar molecules), and at least part of them must be metabolized to their biologically active metabolites (equol for isoflavones and enterolactone for lignans) by intestinal microbiota.
• Bacterial strains capable of phytoestrogen metabolism have been identified.
• The study concluded that phytoestrogens may be effective in breast cancer prevention and treatment, but further research is needed to fully understand their effects.

Sources:

• Journal of the American Nutrition Association. Comprehensive Review of Isoflavones and Lignans in the Prophylaxis and Treatment of Breast Cancer. 2025:1-18.
• NewsRx. New Findings from Wroclaw Medical University Yields New Data on Breast Cancer (Comprehensive Review of Isoflavones and Lignans in the Prophylaxis and Treatment of Breast Cancer). OBGYN & Reproduction Week. September 1, 2025; p 406.