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There is still a lot of debate about it, but soy consumption (processed soy, not naturally fermented soy such as miso and tempeh) has been linked to thyroid problems, as well as being a phytoestrogen. A friend of mine told me that her mother's oncologist (the mother had breast cancer) told her never to eat soy, because it mimics estrogen in the body. Soy, in it's fermented form and in moderation is probably fine, but in our society soy (usually GMO) is heavily processed and is used as filler in so many things that moderation would be impossible. I avoid processed foods, I avoid buying anything with soy in it, and so I don't want my chickens eating it either, since I want to eat their eggs.
The research is conflicting, so when that happens I tend to ask "does this item provide something I cannot get from some other food?" The beneficial things in soy are available in other foods, so when in doubt, I avoid the questionable food.
Ok thank you for the response, I'm going to have to look into it