I think, as soy has been such a ubiquitous food for so long, it's not toxic, or people would be dropping dead left and right.
You are, of course, free to make your own choices.

Alex wrote: Yours understanding is plausible to me.. but I remain skeptical...
>

That's cool. Don't believe what I have to say, I could be wrong. But I'd recommend doing some research if you're so inclined. Googling "soy toxicity" will provide you with some medical studies, both pro and con, so you can make up your own mind. There was a recent one published about soy consumption, brain shrinkage, hormone imbalances, and mental health issues - it got main stream press. Though be wary of sites claiming to be experts when they clearly are not.

Here's one good main-stream article about it:

Too Much of a Good Thing?
Controversy rages over the world's most regaled legume
www.sfgate.com/cgi-bin/article.cgi

The San Francisco Chronicle
James Nestor
Sunday, August 13, 2006

"...And it may be making us sicker than we've ever been. Or so alleges Kaayla Daniel, author of "The Whole Soy Story: The Dark Side of America's Favorite Health Food," an anti-soy treatise released in 2005 by New Trends Publishing.

"People are just starting to wake up to this, to just how serious this all is," says Daniel, who earned her doctorate at the Union Institute and works as a certified nutritionist. "So far, if you look at the studies, you'll start to see that there are only possible benefits of this food, and proven dangers."

For Daniel, the problem exists in the soybean itself, a legume that by nature is chock full of antinutrients and toxins to ward off predators. If eaten in small amounts (say, a few tablespoons every couple of days) these toxins pose no real harm. The trouble occurs when we consume more than 35 grams of soy a day -- a quantity Daniel argues is easily reachable in our modern diet so crammed with soy meats, soy extenders, soy protein and soy emulsifiers, substances so full of estrogens, metals, sugars and additives, so "toxic," that they are posing considerable risks to our collective physical and mental health. ..."