Is Soy Healthy for Breast Cancer Survivors?

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 ( and Flax Seeds & Breast Cancer Survival: Clinical Evidence (

What about women who carry breast cancer genes? I touched on that in 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? (

What about genetically modified soy? I made a video abut that too: GMO Soy and Breast Cancer (

Who Shouldn’t Eat Soy? ( Glad you asked. Watch that video too! 🙂

Not all phytoestrogens may be protective, though. See The Most Potent Phytoestrogen is in Beer ( and What are the Effects of the Hops Phytoestrogen in Beer? (

Have a question about this video? Leave it in the comment section at and someone on the team will try to answer it.

Want to get a list of links to all the scientific sources used in this video? Click on Sources Cited at You’ll also find a transcript of the video, my blog and speaking tour schedule, and an easy way to search (by translated language even) through our videos spanning more than 2,000 health topics.

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Thanks for watching. I hope you’ll join in the evidence-based nutrition revolution!
-Michael Greger, MD FACLM

Image credit: Kristina DeMuth. Image has been modified.
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  1. Go Lightly on February 7, 2023 at 4:08 am

    I love my vanilla soy latte, and now I learned it is not so bad for me! Thank you Dr. Greger for your YouTube videos.

  2. Susana Plant Based Adopt a Cat on February 7, 2023 at 4:08 am

    thank you a million for your work and for sharing.

  3. Crystal Saling on February 7, 2023 at 4:10 am

    "Pass the edamame!" Mmmmmm….edamame, yum!

  4. Jessica Bell on February 7, 2023 at 4:12 am

    too many correlations cited here. Asian cultures eat soy differently to the west. More often fermented and or served with sea vegetables.

  5. nanomyou5 on February 7, 2023 at 4:12 am

    How about this for Triple Negative Breast cancers with no Estrogen receptor alpha expressioon activity?

  6. A J on February 7, 2023 at 4:13 am

    too many people have already been brainwashed by big dairy and think soy is bad makes you grow breasts. these neebs are gullible propaganda followers.

  7. Holista For Life on February 7, 2023 at 4:13 am

    exorphins found in soy are bad for some people who have a missing enzyme to break it down..

  8. Aafie on February 7, 2023 at 4:14 am

    can you speak a bit about oolong tea please?

  9. Mystery Realm on February 7, 2023 at 4:18 am

    There bad information going around about the estrogen and how it causes cancer. Vegan Gains debunked it in one of his videos.

  10. cache on February 7, 2023 at 4:20 am

    thank you for this important information.

  11. Blind and Learning on February 7, 2023 at 4:21 am

    What about soy estrogen and the enlarged prostate

  12. MslaCrissy on February 7, 2023 at 4:25 am I heard that there was a difference in fermented Soy and unfermented Soy. Do these differences play a role? It does not appear that these studies specify. Also, can the fact too, that gmo Soy is what contributes to breast cancer, and not Soy (organic)? Would like to hear your thoughts.

  13. Katie Pecotich on February 7, 2023 at 4:26 am

    go the edamame!! 💕

  14. Half Grid Homestead on February 7, 2023 at 4:26 am

    Indeed!  😉

  15. Gerald Ford on February 7, 2023 at 4:28 am

    3:15 he didn’t say "UNTIL NOW" D: … please Dr. Gregor I need to hear it

  16. lilfubz on February 7, 2023 at 4:28 am

    Can someone explain to me why people think soy is bad for you?

  17. Lynnie B on February 7, 2023 at 4:31 am

    Theory good. But GMO soy vs gmo free soy… the later very very VERY hard to source.

  18. Broccool on February 7, 2023 at 4:32 am

    What is the scoop on tofu?

  19. Rainbow of Boxes on February 7, 2023 at 4:33 am

    My daughter looooves edamame :o) When she was a baby we weren’t vegan… we tried to feed her meat – she hated it! We tried to "sneak" it in her food – she wouldn’t eat it! LOL We are all vegan now (thanks to research we did when she decided to be vegan *herself* as a toddler – research showed she didn’t need meat; but simply the right plant foods). Thanks to people like you – parents like us have up-to-date information to make informed decisions. Much luv 🙂

  20. Svetlana Kovalenko on February 7, 2023 at 4:34 am

    I’m a vegetarian. Is HRT safe for me since I don’t eat animal protein?

  21. dcgfhgjnzgfnjcbgn on February 7, 2023 at 4:34 am

    Dr. Gregor for Surgeon General!

  22. Milind Joshi on February 7, 2023 at 4:35 am

    Well presented data, I am not worried about breast cancer risk, but it is overall allergies and indigestion to soy protein. Also, carrigean used in soy milk causes inflamation.

  23. vegan movie psychos on February 7, 2023 at 4:35 am

    Please do a video on eating tofu while thyroid issues. That would be very interesting. A lot of people say I should quit eating soy, because of my low working thyroid. ❤

  24. Kodi O'Neil on February 7, 2023 at 4:36 am

    If I identify as a mouse does that make soy bad for me?

  25. Falafelzebub's Den of Vegan Iniquity on February 7, 2023 at 4:36 am

    Soy foods are "controversial" solely for their detrimental effects on meat and animal milk sales.

  26. GSatiFan on February 7, 2023 at 4:37 am

    I didn’t know that I was not a mouse… *until now*

  27. Lichtblick on February 7, 2023 at 4:40 am

    I promoto soy too, why? Because it’s healty (only for people who are not brainwashed by the dairy industry)

  28. Henry Reed on February 7, 2023 at 4:42 am

    I drink Soylent and I feel great!

  29. Hello Zhanna on February 7, 2023 at 4:43 am

    This video goes against so many articles and research that I have read talking about how soy is the most GMO and pesticide product on the market. That’s why it’s so cheap, because it’s so easily grown due to genetic modifications. I trust Dr. Gregor, I have been following his channel for at least a year. This is the first video I am questioning, but it’s good, now I have to go and do my own research. I find it strange that in this day and age there is still so much conflicting information about nutrition available all over the Internet. And all those complicated studies with tailored results, make it even harder for general population to understand nutrition. so much reading ahead!

  30. Clayton Winterbourne on February 7, 2023 at 4:43 am

    I’m curious as to how much soybean you have to eat to stay between the 0-10 concentration (nM), shown in the chart at 2:15. That green line to red line ratio is impressive!

  31. peter petrelli on February 7, 2023 at 4:50 am

    What about GMO soy, since it’s the type of soy we are mostly likely to buy nowadays. Is it healthy ?

  32. black cat on February 7, 2023 at 4:50 am

    plaz make video on veg alternative breakfast is corn flakes healthy

  33. Devin Miller on February 7, 2023 at 4:52 am

    I understand that Endometriosis is exacerbated by at least naturally occurring estrogen in the body. I have a friend who wants to go whole-plant based, but she’s afraid of making her issue worse since soy products are common. We are going to work around soy products for now, which is easy enough, but has there been studies, or does anyone know of the effects of soy products and Endometriosis?

  34. Vegetable Police on February 7, 2023 at 4:52 am

    We’re not mice? Speak for yourself!

  35. thenannanh on February 7, 2023 at 4:53 am

    My mom’s doctor told her to avoid soy when she got her breat cancer diagnosis, she is even scarred of all legumes now… Just because her doctor said so she won’t listen to anything else, what do I do?

  36. Brandi LeeMa on February 7, 2023 at 4:54 am

    "But we’re not mice." Lol! 😄
    I was a bottle fed🍼 baby and my mom always says I was her weird child because I would only drink soy formula. Always been a fan of soy milk, have tried other plant based milks but I always come back to soy.

  37. Lucas 7 on February 7, 2023 at 4:56 am

    GMO + Glyphosate soy is the one that cause estrogenic effect, while NON GMO + Organic soy have the opposite effect

  38. PosiVibe !! on February 7, 2023 at 4:57 am

    I may not be a mouse but I struggle not to be a sheep

  39. BijouLover8 on February 7, 2023 at 4:57 am

    Dont believe anything you M.D. Doctors say anymore….especially what the breast cancer society says. All Gov. Funded….greedy and liers. Everyone is starting to wake up to the fact you all are poisoning us. You can keep your Chemo and radiation ….I will stay alternative. Soy is bad for you…PERIOD.

  40. at me on February 7, 2023 at 4:57 am

    I have a question. Would you say these results would count with _soy_ _milk_ as well? I used to drink soy milk all the time (it was organic) and quit a few years ago in an attempt to not consume anything too processed… Since then however my monthly cycles have gotten so much worse and additionally I developed melasma on my face – which my dermatologists claims occurs bc of hormonal reasons. I’m wondering if I’d be better off just starting to incorporate some soy back in to my life <3 Thanks if anyone takes the time to read this, I love and share your videos with everyone I know – reason based arguments for living a plant based lifestyle are A+++. xoxo

  41. Nick Morphew on February 7, 2023 at 4:58 am

    I just passed this information on to a colleague. I hope that with this new information, she can feel safer knowing consumption of soy not only doesn’t increase her risk of recurrence, but significantly HELPS.

  42. Hannah on February 7, 2023 at 4:59 am


  43. Susana Plant Based Adopt a Cat on February 7, 2023 at 5:03 am

    this is the best channel on youtube ever.

  44. Krys Kross on February 7, 2023 at 5:04 am

    Could you do a video on soy and endometriosis? I have a friend who likely has endo, and they are afraid of eating soy because of estrogen, yet consume meat and dairy!

  45. Yo Mama on February 7, 2023 at 5:04 am

    I know Dr. Greger has information about metals in vaccines vs food but does he go into detail about what he thinks about childhood vaccinations?
    I have a child that has had her vaccines and has developmental delays. Didn’t give any to my son, who despises meat, very, very little cheese consumption, drinks only cashew and almond milk but still ended up with developmental delays (he’ll be 3yrs this month).

    My state doesn’t have exceptions other than medical for non vaccinated children entering public schools, which is interfering with early intervention education for my son.

    I know it’s controversial but I trust Dr Greger to not be bias with medical school teachings vs facts.

  46. Chad H on February 7, 2023 at 5:05 am

    "But it turns out…. we aren’t actually mice…" lmao

  47. Vegas Flatout on February 7, 2023 at 5:06 am

    No, soy is not good for you.

  48. JayAntoinette on February 7, 2023 at 5:06 am

    If you haven’t already, can you do a video on the effects of soy on men? It seems like one of the main complaints men have about soy is that it decreases testosterone. I did a bit of my own research but would like to hear your views on it.

  49. James on February 7, 2023 at 5:07 am

    Do other foods have the same anti estrogen effects?