xrichx saidTo summarize:
Soy may or may not be good for you.
This where I generally end up with the argument. I've heard interesting input on both sides. Whether the studies on either side are biased or not is a very tough question. Soy is a massive cash cow for the food industry, well beyond the boundaries of vegan foods and milk substitutes. Soy is used in almost all processed food as it is extremely cheap to grow. Soy lecithin (sometimes referred to simply as Lecithin) is used to change the texture or thickness of most processed food products.
I noticed in the past 6 months that almost all bread products in my local supermarkets now contain soy flour. I have the feeling that even if soy was found by researches to cause health issues that the results most likely would never see the light of day, or would be buried by a host of other studies saying the exact opposite.
Little known fact: "Heroin",the drug, is actually it's brand name. It's a creation of the Bayer company, and was given to soldiers during the first world war. Apparently studies showed that it had absolutely no addictive properties what-so-ever and was therefore a better substitute for morphine.http://en.wikipedia.org/wiki/Charles_Romley_Alder_Wright
I've found that studies are rarely to be trusted entirely as they are so easy to manipulate. A good study on the effects of soy would require decades of study, and a control group that never came in contact with soy, which in today's world would take a small miracle.
I highly suggest anyone switching to a animal free diet should have their vitamin B12 levels monitored by a doctor. I went Raw Vegan for a while and followed a number of well known vegan mentors online, one of which developed dangerously low B12 levels, which she discovered after her energy levels plummeted. Some people are not able to absorb B12 from vitamin pills, and vegan supplements for B12 (deep sea algaes that are high in B12) can actually contain natural components that block the intake of B12 into the body. Just a heads up those going down this path ;)http://www.youtube.com/watch?v=rC1kIAfccjk