Phytoestrogens are plant estrogens, similar to the estrogens produced by the human body. Isoflavones are like human estrogen in chemical shape and properties, but are much weaker than the human form. Isoflavones are believed to reduce the risk of cancer as well as heart disease and osteoporosis.
Osteoporosis is a condition in which bones become less dense, more brittle, and fracture easily.
Soybeans and soy products are a good source of isoflavones. In addition, soy products are low in cholesterol and a good source of healthy fats. There have been many studies in animals and in humans on the relationship between soy and cancer. There is proof that suggests eating soy helps prevent the formation of cancer cells. Scientists are unsure if soy also stops the growth of existing cancer cells.