2

votes

Soy and cancer risk

Answered on August 19, 2014
Created February 24, 2011 at 9:20 PM

When searching pubmed, I only find studies that show soy is protective against cancer... and there are a lot of them - I stopped looking after find these

http://www.ncbi.nlm.nih.gov/pubmed/20956506

http://www.ncbi.nlm.nih.gov/pubmed/20591221

http://www.ncbi.nlm.nih.gov/pubmed/20056634

http://www.ncbi.nlm.nih.gov/pubmed/19996398

http://www.ncbi.nlm.nih.gov/pubmed/19789300

http://www.ncbi.nlm.nih.gov/pubmed/19403632

http://www.ncbi.nlm.nih.gov/pubmed/19353280

http://www.ncbi.nlm.nih.gov/pubmed/19321587

http://www.ncbi.nlm.nih.gov/pubmed/19318430

http://www.ncbi.nlm.nih.gov/pubmed/14628433

Why are there so many articles/discussions linking soy to cancer if there are so many studies that show the opposite? I've read Dr. Mercola articles where he argues the Isoflanones are unhealthy, but many of the above studies argue those are the very things that protect against cancer.

77877f762c40637911396daa19b53094

(78467)

on March 20, 2011
at 05:49 AM

I wonder if soy is more dangerous for Estrogen positive type cancers and less dangerous for progesterone positive or other types of hormone positive cancers. My mom had Estrogen positive breast cancer which is primarily why I went paleo- to help with my estrogen dominance symptoms in the hopes of getting my heredity under control. Although I avoid soy, I do think sugar and grains and omega 6/3 ratios are more important to look at for cancer prevention.

0bfdf7389bad373ddc87525001dece59

(0)

on February 25, 2011
at 06:22 PM

A good retort for "Asians eat soy and have less breast cancer..." or any epidemiological study along those lines is just to point out their sugar consumption in comparison to America's 150lbs/year.

95601768ec9cb75cc3a9cbcd2271ed14

(2206)

on February 25, 2011
at 01:28 AM

i would second this--this book answered a lot of my questions--and scared the crap out of me.

04293f705870e1837b8670d3c1cd5f67

(2261)

on February 24, 2011
at 11:40 PM

On the flip side, what "organization" has the incentive to dis-prove this notion, that soy is beneficial for breast cancer? These organizations do the studies so they prove something about their product (or give money to have it studied)

3a833804187fe8926214e6c0bd8a0766

(1023)

on February 24, 2011
at 09:57 PM

So what are we going on then? Why do people like Dr. Mercola say it's unhealthy, yet there are plenty of studies showing the opposite?

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6 Answers

3
1acc4ee9381d9a8d998b59915b3f997e

(2099)

on February 24, 2011
at 10:11 PM

I recommend that you read The Whole Soy Story: the dark side of America's favorite health food by Kaayla T. Daniel, PhD. CCN. for the answer to your question.

95601768ec9cb75cc3a9cbcd2271ed14

(2206)

on February 25, 2011
at 01:28 AM

i would second this--this book answered a lot of my questions--and scared the crap out of me.

2
Medium avatar

on February 24, 2011
at 09:54 PM

I'm sure there are plenty of studies that show the health benefits of various subsidized grains and legumes. I wish pubmed listed all of those who funded them.

3a833804187fe8926214e6c0bd8a0766

(1023)

on February 24, 2011
at 09:57 PM

So what are we going on then? Why do people like Dr. Mercola say it's unhealthy, yet there are plenty of studies showing the opposite?

04293f705870e1837b8670d3c1cd5f67

(2261)

on February 24, 2011
at 11:40 PM

On the flip side, what "organization" has the incentive to dis-prove this notion, that soy is beneficial for breast cancer? These organizations do the studies so they prove something about their product (or give money to have it studied)

77877f762c40637911396daa19b53094

(78467)

on March 20, 2011
at 05:49 AM

I wonder if soy is more dangerous for Estrogen positive type cancers and less dangerous for progesterone positive or other types of hormone positive cancers. My mom had Estrogen positive breast cancer which is primarily why I went paleo- to help with my estrogen dominance symptoms in the hopes of getting my heredity under control. Although I avoid soy, I do think sugar and grains and omega 6/3 ratios are more important to look at for cancer prevention.

1
F1b39d4f620876330312f4925bd51900

(4090)

on February 24, 2011
at 11:35 PM

Soy is beneficial is you need an estrogen boost (like menopausal women). These studies probably used extracts or isolates. But overall Soy is not so great (beyond not so great)for digestion, thyroid ect..

Here are a couple of links:

http://civileats.com/2010/12/09/the-truth-about-soy-health-claims/

http://www.foodrenegade.com/dangers-of-soy/

Here is a great book to read that has a whole section on the dangers of soy...

The vegetarian myth by lierre keith

Interesting note: this author was attacked at a book reading by vegans. They threw hot pepper laden whip cream pies in her face. Wow, the power of meat is amazing.

0
13b40c07d0aab810f48eec3d04877010

(410)

on February 24, 2011
at 11:47 PM

I'm not sure the linked studies prove a protective effect from soy... didn't look at them all, but the few I checked were epidemiological. So, were there fewer cancers in the soy groups because of the soy consumption or because of some other factor soy eaters have in common?

Susan J. Komen for the Cure has a list of risk factors for breast cancer... soy is listed as "under study"... the explanation they provide is that some studies show a protective effect and others show a negative one. Individual links were not provided as far as I could tell though - just a long list of references that I do not have time to read through!

I am a breast cancer survivor and do not eat soy. My oncologist gave me the green light invoking the "Asians eat soy and have less breast cancer..." line. However, there is some controversy about the quantities/type of soy actually consumed in Asia. Also, soy seems to have many other negatives and few (if any) positives that I see no reason to take the risk.

BTW, I got breast cancer at 38 years old. No significant family history, brca negative. I was vegetarian from about age 19 until around 29 and ate lots of soy during this period. According to what I've read a cancerous tumor that can be felt has most likely been growing for about 8-10 years...

0bfdf7389bad373ddc87525001dece59

(0)

on February 25, 2011
at 06:22 PM

A good retort for "Asians eat soy and have less breast cancer..." or any epidemiological study along those lines is just to point out their sugar consumption in comparison to America's 150lbs/year.

0
04293f705870e1837b8670d3c1cd5f67

on February 24, 2011
at 11:43 PM

I would never take the risk & I was happily surprised that my girlfriend's Oncologist (she has breast cancer) told her to NEVER eat estrogen containing stuff (food) like soy ever in the future.

0
Af1d286f0fd5c3949f59b4edf4d892f5

(18472)

on February 24, 2011
at 10:45 PM

Yah and although WAPF is not really Paleo per se, they have a lot of pretty informative articles on the dangers of soy. I'm not saying I agree with all of it, but I think I've read enough to know that soy carries far too many risks to consume it on purpose. If you are out with friends and have a couple of appetizer edamame beans, then fine whatever... but I avoid soy and soy based foods now.

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