Soy and early puberty PART 2
I would like to add that these formulas contain B12 vitamins quantities needed. For this reason, mothers who can not breastfeed their infants and breast and who decide to soymilk should contact their pediatrician, who will determine the quantities of vitamin B12 and possibly iron or anything that be supplemented.
A few more words about phytoestrogens, that belong to secondary plant substances. A subset of phytoestrogens are isoflavones – genistein, daidzein and glicetin, rich represented in soy. Financial interests have suggested that they produce reproductive disorders, infertility disorders and functional thyroid gland disorders. The work that I presented a shatteres these opinions, and the fear that soy milk, by the high contents in these isoflavones, would be dangerous for infants is not motivated neither that, while 100 grams of soy contain 42,000 micrograms of isoflavones, 100 g of soy milk only contain 252 micrograms.
On the other hand, compared to natural estrogens, isoflavones present only a very weak estrogenic action, the proportion being 1,000 / 1. Isoflavones fixes on the estrogen receptors without having an estrogenic action. Instead, blocking the receptors by estrogen prevents the isoflavones strong natural action. Through this mechanism, isoflavones act as anti-estrogens. Also, isoflavones can stimulate the globulin synthesis which fixes the sexual natural hormone, that in the circulation will be more estrogen in the linked form, with a small biological activity.
It has been shown that genistein, daidzein and glycetin have antioxidant properties, pointed against oxidative lesions of the lipid membranes, lipoprotein particle and against DNA oxidative lesions, without the plasma oxidation being affected. Isoflavones protect against lipid lesions involved in the development of cardiovascular diseases and cancer. Isoflavones can help the processing of LDL, lowering the thus atheroma plaque forming. On the other hand, the regular soy consumption reduces the breast cancer risk significantly, the one that occurs before menopause, as well as the one that occurs after menopause. Anticancer effects are most evident in the early stages of carcinogenesis. An authority in this area claims that the use of soy milk feeding in infants should be encouraged.
At the Congress of Gastroenterology held in Atlanta during 20 to 30 May 2001, was shown that isoflavones from soy have an protective effect against experimental colitis and gastritis due to anti-inflammatory properties.
German chemists society concluded that isoflavones genistein not only that has no negative effects, but is a stimulating factor of human health.
At the international conference “Soy and Health” 30-31 May 2002 held at the Queen Elizabeth Centre, London, professor Kenneth Setchell from Children’s Hospital Medical Centre, USA, showed that the effects of isoflavones from soy pertain to the ability of the body to convert them into a metabolite known as equol. Equol is an exclusive product of the daidzein metabolism by intestinal bacteria. Equol has a strong estrogenic activity with affinity for the estrogen receptors. As concerns the antioxidant action, equol is superior to all other isoflavones.
In the past, soy saponins were considered antinutrients. Now is known that saponins have anti-cancer action, cholesterol lowering and stimulation of the immune system. It is believed that they could play an important role in diabetes, cardiovascular diseases and cancers, particularly in colorectal cancer. Saponins are found in other vegetable too, but in smaller concentrations.
Finally, one of vitamins regarded as having a particularly role in the prophylaxis of the chronic affections is folate or folic acid. Soy contains large amounts of folic acid than meat. But what about vitamin E? Soy contains ten times more vitamin E than meat.