Typically, soy may be a healthy food if it is fermented and organic.
All soy crops in the US that are not grown without pesticides are GMO - in other words, soaked with, and genetically spliced with pesticide.
Pesticides in and of themselves are estrogen mimickers. Combine that with unfermented soy foods and you have a double whammy of estrogen.
Estrogen - out of balance with other hormones - can cause:
- weight gain
- heavy periods and pain
- uterine fibroids
- thryoid deficiencies (leading to weight gain)
It really is not a fun scenario.
Fermented organic soy products are healthy.
For instance San-J Tamari - soy sauce without wheat - has a good vitamin B12 content. It is very flavorful, more than soy sauce. It is also Gluten free, organic and comes in a reduced sodium version too.
Miso paste - organic and in the Red version - is also good for vitamin B12.
Here is a page full of information about estrogen dominance, if you want more. I am not familiar with the supplements is shows, but the info is excellent.
Here is a short video about estrogen rich foods and how harmful they can be.