The best guide as to how suitable a food is will be your own perception after you have consumed enough of it.
The trouble is that in this day and age many people do not have well developed objective sensitivity to their own bodies. Many (not all) Chefs live a fast and furious life and are poor candidates for the time consuming hobbies of sports, yoga, meditation and all those activities that help you further develop awareness.
Then you have to rely on outside sources of information to narrow the options. When it comes to food, drugs and agricultural chemicals there is a whole plethera of competiting interests. What amazes me is the canny ability of these groups to make both opposing arguments sound logical, scientific and like the one you have to believe.
When I did a search using "google" on the Soy topic there were oodles of results to look at. This is not a judgement on the final outcome of the topic, but it was interesting to see how many of the pro soy results were from the multinational corporations and soy marketing boards.
If you are really interested in the topic then wade through some of these results from a google search using the keywords: "trypsin inhibitor soy concerns"
http://www.google.com/search?hl=en&s...=Google+Search
It's early days still as to finding out what is the truth, and the positive and negative effects of the use of Soy products.
We like and eat unpasturised organic miso and use quality soy sauce, that is the limit of our exposure to the bean.