Stay Away From Soy

Monsanto selected cotton and soybean as its first tinkling crops by inserting its extremely toxic weed killer roundups so that the plants will withstand heavy dosage of roundups application. The safety for human consumption was never studied but today 90 percent of dietary products contain GMO soybeans.
According to NaturalNews, the modern age of industrial agriculture and manufacturing has dumped heavy metals, carninogens, plastics, and pesticides into the environment at alarming rates. These toxins are showing up in most human tissue cells today. One distinct chemical may be trapping these toxins in human cells, limiting the human body's ability to detoxify its own cells. In a new peer reviewed study, this sinister chemical, glyphosate, has been proven to inhibit the human cell's ability to detoxify altogether. Glyphosate, found in Monsanto's Roundup, is being deemed by publishers of the new study "one of the most dangerous chemicals" being unleashed into the environment today.

Learn more: http://www.naturalnews.com/040482_glyphosate_monsanto_detoxification.html
I generally avoid soy bean dishes offered in the restaurant. I do use Trader Joe's organic soybean products Now I have to minimize the usage after I found out that soy contains phytic acid which will remove essential nutrients and minerals from your body.
The following information was from David Permutter M.D, a neurosurgeon, recent email. 
First, almost all the soy available these days is genetically modified. I feel quite strongly that GMO produced foods represent a significant health risk for humans (and animals for that matter.). This is food that could have been treated with dangerous pesticides such as Roundup, . Eating GMO food, or potentially GMO food, it’s an unnecessary way to introduce toxins into our bodies.

Second, soy is a legume. Soy is thus high in Phytic Acid. Phytic acid tends to bind  minerals and remove them from the body, which may lead to mineral deficiencies. In the process of adding what you think is actually a health-beneficial item to your diet, you are, in fact, removing essential nutrients and minerals from it instead.