Re: Re: This is For Easto's Protein Question and others
taboo74 said:
Any truth to the word I have heard that soy pritein can promote estrogen...just curious..
Soy isoflavones are estrogen-like molecules. Environmental toxicologists refer to such things as xenoestrogens. Many health care professionals are extremely concerned that human health is adversely affected by increasing intake of xenoestrogens, including soy isoflavones, because they stimulate various undesirable growth processes in girls and women, and may interfere with normal hormone dependent development of boys and functional capacities of men.
In 1997, researchers reported that "The daily exposure of infants to isoflavones in soy infant formulas is 6- to 11 fold higher on a body weight basis than the dose that has hormonal effects in adults consuming soy foods. Circulating concentrations of isoflavones in the seven infants fed soy-based formula were 13000-22000 times higher than plasma oestradiol concentrations in early life, and may be sufficient to exert biological effects, whereas the contribution of isoflavones from breast-milk and cow-milk is negligible." [Lancet 1997 Jul 5, 350: 9070, 23-7]
In 1998 researchers from New Zealand reported that the rate of isoflavone intake in infants fed soy-based formulas, cereals, dinners, and biscuits "is much greater than that shown in adult humans to alter reproductive hormones." They advised: "Since the available evidence suggests that infants can digest and absorb dietary phytoestrogens in active forms and since neonates are generally more susceptible than adults to perturbations of the sex steroid milieu, we suggest that it would be highly desirable to study the effects of soy isoflavones on steroid-dependent developmental processes in human babies. [Proc Soc Exp Biol Med 1998 Mar 217: 3, 247-53]
Previous to these recent studies, in 1982, pediatric endocrinologists in Puerto Rico reported an increase in the incidence of premature breast development in girls under eight years of age. Of 130 cases studied, 85 involved breast development in girls under 18 months of age. Of those 85 cases, 22 were found associated with use of soy formula, rich in isoflavones. [Am J Dis Child 1986 Dec 140: 12 1263-7]
Full article here;
http://www.iartonline.ca/articles/soyprotein.html