

In the past decade, soy consumption has increased tremendously with the popularity of sushi and information of lower cancer rates in Asian countries. In the United States, however, many of the soy bean plants have been genetically modified and paired with heavy doses pesticides required to prevent common crop disease and insects.*
Soy products are classified as phyto-estrogens so they have the same effect as taking estrogen. The phytic acids, or phytates found in soy can also alter the absorption of essential minerals and breakdown of proteins.
New research is now surfacing that soy could contribute to higher estrogen levels In fact, some onocologist are recommending the removal all soy products from their patient's diets as a precaution.
For those individuals diagnosed with estrogen-fueled cancer, those currently receiving chemotherapy or anyone with a cancer gene, you may want to speak to your doctor about eating soy products, including tofu, a staple of many vegetarian diets.
*Souce and additional information in link below
http://www.ehow.com/facts_5002311_adverse-effects-soy-products.html