Extracted from this page:

http://gerson.org/healing/articles/nl_soytoogood2.htm

Monsanto has gained millions in profits from sales of its popular
herbicide, Roundup®, and in turn has produced several transgenic crops that
resist it. Soy is of course among those Roundup-Ready® crops. Being
resistant to this powerful herbicide, farmers are able to spray more of it
on their crops, resulting in higher levels of toxins in the harvested
product. Recent studies have shown that sprayed soybean crops have an
elevated estrogen level (much higher than the soybean's already high
levels). As we mentioned earlier, the synergistic effect of these estrogens
- especially on children ingesting soy based formula is unknown, but in a
recent study reported in Pediatrics raised a few eyebrows. "Investigators
found that one percent of all girls now show signs of puberty, such as
breast development or pubic hair before the age of THREE; by age eight 14.7
percent of Caucasian girls and a whopping 48.3 percent of African-American
girls had one or both of these characteristics" states Sally Fallon in the
Price-Pottinger article on soy. (For a natural alternative to soy and milk
based formula, see Nourishing Traditions, available through PPNF at
619-574-7763). 

These higher estrogen levels have proven to increase amounts of fat
produced in the milk of cows fed the altered altered and sprayed beans.
Together with the use of rBGH, the elevated estrogen levels bring into
question whether cows milk can really be called milk.