As a vegetarian and Asian male, soy and soy products have been a key part of my diet. I need to know if there are serious health consequences in consuming moderate amounts of soy in its many forms such as soy sauce, tofu, edamame, soy milk, and soy isolates in protein powders and bars. Soy is also low in fat and calories and high in protein but I know soy also contains phytoestrogen which sounds scary. I also want to look at the difference between fermented soy and unfermented soy as this difference appears to breakdown particular chemical substances found in soy.
For this board, I'm looking at soy across various populations: male and female, across age groups, and ideally across different ethnic groups.
Some links I've used to help compile this board include:
http://www.mensfitness.com/nutrition/what-to-eat/does-soy-really-cause-man-boobs
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1480510/
https://examine.com/nutrition/is-soy-good-or-bad-for-me/
https://www.hsph.harvard.edu/nutritionsource/2014/02/12/straight-talk-about-soy/
http://www.veganhealth.org/articles/soy_wth#iso
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3257705/
https://tonic.vice.com/en_us/article/vdb383/no-eating-soy-isnt-going-to-give-you-manboobs
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3257705/
http://www.aafp.org/afp/2009/0101/p43.html
http://lpi.oregonstate.edu/mic/dietary-factors/phytochemicals/soy-isoflavones
https://well.blogs.nytimes.com/2013/09/27/ask-well-is-it-safe-to-eat-soy/
created on 9/13/17 @ 03:44AM, updated on 10/3/17 @ 04:28PM
Summary
Overall, it is safe to say most soy products are safe to eat if not beneficial for your health with moderate consumption (1-2 servings of soy food daily, less than 25g of soy protein from non-concentrate sources). Soy in the form of soy milk, tofu, edamame, and soy proteins (isolates and concentrates) generally provide a high amount of protein with little amounts of fats and calories.
Adding soy to the diet has also been shown to be beneficial in controlling certain diseases such as cardiovascular disease, lung cancer, and breast cancer in for those afflicted.
While soy does contain a plant based estrogen or phytoestrogen called isoflavone, some studies show this weaker form of estrogen acts as a protective measure in regulating estrogen levels instead of adding to estrogen levels. It is believed that the the isoflavones act as a competitive inhibitor to other sources of estrogen in the body. Additionally, several studies have looked at soy's ability to affect hormonal levels generally across populations. The most comprehensive studies found no serious dangers associated with increased soy consumption. It is also important to note that isoflavones are dramatically reduced during the processing of soybeans in several soy products.
by P. G. Giampietro, G Bruno, Giuseppe Furcolo, Alessandra Casati, Ercole Brunetti, Gian Luigi Spadoni, Elena Galli
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Actinopolyspora Biskrensis
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The Journal of Clinical Endocrinology & Metabolism
by Antonella Dewell, Piper L. W. Hollenbeck, C. B. Hollenbeck
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by Peter Deibert, Florian Solleder, Daniel König, Mara Z. Vitolins, Hans-hermann Dickhuth, Albert Gollhofer, Aloys Berg
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by Frank M. Sacks, Alice H. Lichtenstein, Linda Van Horn, William S. Harris, Penny M. Kris‐Etherton, Mary Winston
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Would be useful to know any health effects of eating soy vs eating meat.