The real reason for the promotion of soy is the need for agribusiness to utilize the byproduct of soy oil. This byproduct is mainly protein. If the byproduct can be converted into a saleable product, agribusiness not only makes more money but also saves money on the disposal of this protein sludge.

Kaayla T. Daniel, PhD, CCN, explains very clearly in her book, "The Whole Soy Story... the health risks in eating soy". Below is a recap from Dr. Daniels book (pg 38 - 39):

"All soybeans contain antinutritional factors (known as antinutrients) and toxins. Mother Nature puts them there to block seeds from sprouting prematurely and to harm insects and other predators that would otherwise eat too many of them. Unfortunately, they can harm us as well unless the soybeans are properly processed to neutralize them.

This brief glossary is provided to help readers more easily understand this section's discussion of types of soyfoods and the qualitative differences between old-fashioned and modern processing methods.

ALLERGENS cause allergic reactions. Soy is one of the top 8 allergens.

GOITROGENS damage the thyroid.

LECTINS cause red blood cells to clump together and may cause immune system reactions.

OLIGOSACCHARIDES are the pesky sugars that cause bloating and flatulence.

OXALATES prevent proper absorption of calcium and have been linked to kidney stones and a painful disease known as vulvodynia.

PHYTATES impair absorption of minerals such as zinc, iron, and calcium.

ISOFLAVONES are phytoestrogens (plant estrogens) that act like hormones and affect the reproductive and nervous systems. Some of the best known isoflavones are genistein and daidzein.

PROTEASE INHIBITORS, mostly notably TRYPSIN INHIBITORS interfere with the digestive enzymes protease and trypsin. This can lead to gastric distress, poor protein digestion and an overworked pancreas.

SAPONINS bind with bile. They may lower cholesterol and may damage the intestinal lining."

Madwoman highly recommends Dr Daniels book, "The Whole Soy Story" and "Nourishing Traditions" by Dr Sally Fallon where you can read more about the antinutrients and toxins in soy.