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Retha R. Newbold, a supervisory research biologist at the National Institute of Environmental Health Sciences (NIEHS) states that concerns regarding the effects of soy Isoflavones on health are due to research performed on mice. Research on mice given isolated soy Isoflavones found it caused uterine cancer, infertility, and premature puberty. Furthermore, soy Isoflavones are known to reduce iodine absorption which can have a negative effect on thyroid functioning. This is the main reason why soy milk is often fortified with iodine to counteract this effect. Because of this action of soy, there has been great concern regarding the safety of soy-based infant formulas. Furthermore, taking soy in too high amounts may also have negative health outcomes such as severe mineral deficiencies so taking soy at the reasonable 2-7g a day is recommended.
What are the side effects of soy isoflavones?
As already mentioned, modern research has identified a number of side effects caused by soy isoflavones, such as premature puberty, infertility and even uterine cancer. It has also been discovered that soy isoflavones could affect the functioning of the thyroid gland, impairing the absorption of iodine. Moreover, in high doses, they can lead to mineral deficiencies. *