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Plant substances that are known to block the action of the hormone oestrogen in the body. As many incidences of breast cancer are thought to be related to stimulation of breast tissue by oestrogen. This had led to the theory that phytoestrogens might reduce the levels of breast cancer.
As soy products are rich in phytoestrgens they are recommended as part of a breast cancer reduction package. However, recent scares about soy on in themselves ongoing.