Lignans are a group of phytoestrogens found alongside fiber in whole grains, beans, berries, nuts, and seeds. Plant lignans are converted to bioactive mammalian lignans within the gut by native bacteria.
Lignans have shown and been associated with protective effects against the development of cancer. Flaxseed lignans have been specifically associated with antiestrogenic effects that may be beneficial to breast cancer prevention. See: Phytoestrogens
Flax, whole grains, beans, berries, nuts, seeds, coffee, tea, wine