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Phytoestrogen Poison? |
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The male species of tropical birds carries the drab plumage of the female at birth and 'colors up' at maturity, somewhere between nine and 24 months. In 1991, Richard and Valerie James, bird breeders in Whangerai, New Zealand, purchased a new kind of feed for their birds - one based largely on soy protein. When soy-based feed was used, their birds 'colored up' after just a few months. In fact, one bird-food manufacturer claimed that this early development was an advantage imparted by the feed. A 1992 ad for Roudybush feed formula showed a picture of the male crimson rosella, an Australian parrot that acquires beautiful red plumage at 18 to 24 months, already brightly colored at 11 weeks old.
Unfortunately, in the ensuing years, there was decreased fertility in the birds, with precocious maturation, deformed, stunted and stillborn babies, and premature deaths, especially among females.
The birds suffered beak and bone deformities, goiter, immune system disorders and pathological, aggressive behavior. Autopsy revealed digestive organs in a state of disintegration. The list of problems corresponded with many of the problems the James’s had encountered in their two children, who had been fed soy-based infant formula.
The James’s hired toxicologist Mike Fitzpatrick. PhD, to investigate further. Dr Fitzpatrick's literature review uncovered evidence that soy consumption has been linked to numerous disorders, including infertility, increased cancer and infantile leukemia; and, in studies dating back to the 1950s,48 that genistein in soy causes endocrine disruption in animals.
Dr Fitzpatrick also analyzed the bird feed and found that it contained high levels of phytoestrogens, especially genistein. When the James’s discontinued using soy-based feed, the flock gradually returned to normal breeding habits and behavior.
In 1991, Japanese researchers reported that consumption of as little as 30 grams or two tablespoons of soybeans per day for only one month resulted in a significant increase in thyroid-stimulating hormone (TSH). Increased TSH “tells the body” to stop making thyroid hormone. Diffuse goiter and hypothyroidism appeared in some of the subjects and many complained of constipation, fatigue and lethargy, even though their intake of iodine was adequate.
Twenty-five grams of soy protein isolate contains from 50 to 70 mg of isoflavones. It took only 45 mg of isoflavones in premenopausal women to exert significant estrogenic effects. These effects lingered for three months after soy consumption was discontinued.
One hundred grams of soy protein - the maximum suggested cholesterol-lowering dose, and the amount recommended by Protein Technologies International - can contain almost 600 mg of isoflavones, an amount that is undeniably toxic. In 1992, the Swiss health service estimated that 100 grams of soy protein provided the estrogenic equivalent of a birth control pill.
Studies suggest that isoflavones inhibit synthesis of estradiol and other steroid hormones. Reproductive problems, infertility, thyroid disease and liver disease due to dietary intake of isoflavones have been observed for several species of animals including mice, cheetah, quail, pigs, rats, sturgeon and sheep.
Soy isoflavones are said to have a favorable effect on postmenopausal symptoms, including hot flushes, and protection from osteoporosis. The claim that soy prevents osteoporosis is extraordinary, given that soy foods block calcium and cause vitamin D deficiencies.
Again, it seems clear that soy products are not fit for human consumption. They can enhance estrogen activity, decrease male hormone production, interfere with iodine uptake, lower thyroid hormones, and prematurely brighten the colors on a male bird. However, our country has a glut of cheap, dangerous soy products in practically every food store – even those who proclaim that the sell “health food”. Don’t be fooled. Soy is dangerous and should not be consumed by any human.
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