Re: so I assume
#359254 - 06/13/10 02:03 PM
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Syl
Reged: 03/13/05
Posts: 5499
Loc: SK, CANADA
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You might direct your teacher to the following review of the effect of soy protein and soybean isoflavones on thyroid function (See Reference below)
"Soy foods are a traditional staple of Asian diets but because of their purported health benefits they have become popular in recent years among non-Asians, especially postmenopausal women. There are many bioactive soybean components that may contribute to the hypothesized health benefits of soy but most attention has focused on the isoflavones, which have both hormonal and nonhormonal properties. However, despite the possible benefits concerns have been expressed that soy may be contraindicated for some subsets of the population. One concern is that soy may adversely affect thyroid function and interfere with the absorption of synthetic thyroid hormone. Thus, the purpose of this review is to evaluate the relevant literature and provide the clinician guidance for advising their patients about the effects of soy on thyroid function. In total, 14 trials (thyroid function was not the primary health outcome in any trial) were identified in which the effects of soy foods or isoflavones on at least one measure of thyroid function was assessed in presumably healthy subjects; eight involved women only, four involved men, and two both men and women. With only one exception, either no effects or only very modest changes were noted in these trials. Thus, collectively the findings provide little evidence that in euthyroid , iodine-replete individuals, soy foods, or isoflavones adversely affect thyroid function. In contrast, some evidence suggests that soy foods, by inhibiting absorption, may increase the dose of thyroid hormone required by hypothyroid patients. However, hypothyroid adults need not avoid soy foods. In addition, there remains a theoretical concern based on in vitro and animal data that in individuals with compromised thyroid function and/or whose iodine intake is marginal soy foods may increase risk of developing clinical hypothyroidism. Therefore, it is important for soy food consumers to make sure their intake of iodine is adequate."
Reference Messina, M., & Redmond, G. (2006). Effects of soy protein and soybean isoflavones on thyroid function in healthy adults and hypothyroid patients: A review of the relevant literature.. . Thyroid, 16(3), 249-258
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Ok I will thx but it does say there were some modest changes in some of the trials so what exactly does that mean? And how long were they eating soy and how much and what soy products were they given? Thats all important. The last sentence does says that soy consumers should make sure their iodine is adequate.
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I am sure soy is fine for woman but not so sure about men. I have read quite a few recent studies that show significant findings that soy will increase estrogen levels in men if consuming more than about 25 grams per day.
-------------------- IBS-D for 12 years
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Re: so I assume
#359263 - 06/13/10 08:50 PM
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Syl
Reged: 03/13/05
Posts: 5499
Loc: SK, CANADA
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It is a review of many studies. He will have to look at the individual studies to get the details. They are referenced in the article. Everyone needs some iodine in there diet about 100 micrograms which is quite easy to get from a normal diet particularly if you use iodized salt.
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You may want to check this recent article (see reference below). It reviewed the research to date and found "that isoflavones do not exert feminizing effects on men at intake levels equal to and even considerably higher than are typical for Asian males". In the body of the article it concludes "the clinical evidence overwhelmingly indicates that there is essentially no basis for concern. Isoflavone exposure at levels even greatly exceeding reasonable dietary intakes does not affect blood T or estrogen levels in men or sperm and semen parameters". There is a lot of misinformation floating around about soy.
Reference Messina M., Soybean isoflavone exposure does not have feminizing effects on men: a critical examination of the clinical evidence , Fertility and Sterility, 93, 7, pp 2095-2104, 2010
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Syl, I went to the same website you did and found articles that say the opposite so how do you know what to believe? Also, my teacher who is telling us this information has been working with people for 35 years in a clinic and has witnessed the effects of soy and how when they get off the soy their symptoms improve. He has also witnessed women who are all about a high soy diet often end up with thyroid problems. I believe what he says.
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That web site is the U.S. National Library of Medicine National Institutes of Health web site. It indexes articles irrespective if they are good, bad or otherwise. If you do a search using "soy AND thyroid" you will notice that many of the articles refer to research on mice, rats, dogs and other animals. These results cannot be translated to similar effects in humans. You might check with your GP or an endocrinologist who can enlighten you more about the accuracy of what you are being taught.
What is the name of school at which you are taking your naturopathy course?
-------------------- STABLE: ♂, IBS-D 50+ years - Science of IBS
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