Yeah, raw soy has been shown to slightly increase estrogen and decrease testosterone. I don't think that's the biggest problem though. It's just the protein isn't utilized well by the human body, and related species to humans. There's a study where pigs essentially become very frail and weak when given entirely soy protein, but are perfectly healthy when given entirely casein protein. It's in Berardi's lean eating 1 article, and I've looked it up on pubmed before.
Also, soy can encourage hypothyroid. FDA scientists warned about this in a letter of protest to the FDA labeling soy as heart healthy several years ago.
http://johnberardi.com/articles/nutrition/leaneating_1.htm
Also, soy can encourage hypothyroid. FDA scientists warned about this in a letter of protest to the FDA labeling soy as heart healthy several years ago.
Finally, Lohrke et al (2001) showed that growing pigs fed a diet consisting of soy as the only source of protein had lower body weights, amino acid imbalances, increased cortisol levels, and increased muscle breakdown. The casein-fed pigs grew normally. This study indicates that a diet containing exclusively a low quality protein (soy in this case) may interfere with normal growth and development.
http://johnberardi.com/articles/nutrition/leaneating_1.htm