Then maybe it's the red meat that's causing the problems here and not soy.
The soy phytoestrogen research was done in this country, where a majority of the people are caucasian.
You'd have to look at the specific research to determine what was done and if it supports their conclusions. Most of the research I've seen in this country has been in animals and in many of these studies they've fed amounts of soybeans to the animals that have no relationship to real world human consumption. This is a typical ploy in much research today and it is absolutely wrong to draw conclusions from animal studies even with species that seem quite closely related to humans because they function quite differently than humans at a molecular level. I've read a test where baby rats didn't thrive on soy milk so the researchers made all sorts of wacky conclusions and then asked for more grant money. What these researchers didn't tell you was that the baby rats didn't survive on human breast milk either.
You say that isoflavones are phyto-endocrine disruptors. What do you mean by this and what are the negative effects of this disruption?
First, it is my understanding that there is little red meat in the Okinawans diet, so perhaps that contributes to their relative cancer rates. Endocrine disruptors are substances in food and the environment that affect the endocrine system, which coordinates various body functions, including the way we metabolize our food and maintain our body temperature (as well as ovulation). They can attach to the receptors for naturally occuring hormones, such as estrogen or testosterone, substituing for them or blocking the action of those hormones. The also have the possibility of changing the chemical message of our hormones, and can interfer with the production of natural hormones or our hormone receptors. In the case I am most familiar with, the overuse of soy phytoestrogen surpressed the production and utilization of the thyroid hormone T3, resulting in a number of medical problems.