Is Soy Healthy for Breast Cancer Survivors?
What role do soy phytoestrogens play in the prevention and treatment of breast cancer?
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This is probably the same reason flax seeds are so protective. See Flax Seeds & Breast Cancer Survival: Epidemiological Evidence (http://nutritionfacts.org/video/flaxseeds-breast-cancer-survival-epidemiological-evidence/) and Flax Seeds & Breast Cancer Survival: Clinical Evidence (http://nutritionfacts.org/video/flaxseeds-breast-cancer-survival-clinical-evidence/).
What about women who carry breast cancer genes? I touched on that in BRCA Breast Cancer Genes and Soy (http://nutritionfacts.org/video/brca-breast-cancer-genes-and-soy/) and it’s the topic of my next video, Should Women at High Risk for Breast Cancer Avoid Soy? (http://nutritionfacts.org/video/should-women-at-high-risk-for-breast-cancer-avoid-soy).
What about genetically modified soy? I made a video abut that too: GMO Soy and Breast Cancer (http://nutritionfacts.org/video/gmo-soy-and-breast-cancer/).
Who Shouldn’t Eat Soy? (http://nutritionfacts.org/video/who-shouldnt-eat-soy) Glad you asked. Watch that video too! :)
Not all phytoestrogens may be protective, though. See The Most Potent Phytoestrogen is in Beer (http://nutritionfacts.org/video/the-most-potent-phytoestrogen-is-in-beer/) and What are the Effects of the Hops Phytoestrogen in Beer? (http://nutritionfacts.org/video/what-are-the-effects-of-the-hops-phytoestrogen-in-beer/).
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-Michael Greger, MD FACLM
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Transcript
English (auto-generated)Auto-generated
712 words
4271 chars
4 min read
[Music] soy foods have become controversial in recent years even among health professionals exacerbated by misinformation found on the internet Chief among the misconceptions is that soy foods promote breast cancer because they contain a class of phytoestrogen compounds called isoflavones since estrogens can promote breast cancer growth it's natural to assume phytoestrogens might too but people don't realize there are two types of estrogen receptors in the body Alpha and beta and unlike actual estrogen soy phytoestrogens preferentially bind to an activate estrogen receptor beta this distinction is important because the two types of receptors have different tissue distributions and often function differently and sometimes in opposite ways and this appears to be the case in the breast where beta activation has an anti-estrogenic effect inhibiting Theo growth promotion effects of actual estrogen uh something we've known for more than 10 years there's no excuse anymore the effects of estradi the primary human estrogen on breast cells are completely opposite to those of soy phytoestrogens which have anti-proliferative effects on breast cancer cells even at the low concentrations one gets in one's bloodstream eating just a few servings of soy which makes sense given that after eating a cup of soy beans the levels in our blood cause significant beta receptor Activation so where did this outdated notion that soy could increase breast cancer risk come from the concern was based largely on Research that showed that the main soy phytoestrogen genistin stimulates the growth of mamory tumors in a type of mouse but it turns out we're not actually mice we metabolize soy isoflavones very differently from rodents the same soy leads to 20 to 150 times higher levels in the bloodstream of rodents the breast cancer Mouse in question was 58 Times Higher so if you ate 58 cups of soy beans a day you could get some significant Alpha activation too but thankfully we're not hairless AIC...
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