Are you a woman who eats soy, drinks soy milk, munches edamame or takes soy isoflavones as a supplement thinking it will help you with hot flashes, night sweats and other inconvenient and uncomfortable menopausal or perimenopausal symptoms?
As it turns out, the risks of soy to hormone health are significant. It is not the middle aged health panacea for women that is is promoted to be! If your doctor is harping on the benefits of soy to alleviate your discomfort, find a new doctor!
Studies show that even small amounts of unfermented soy has the potential to disrupt female hormonal balance. This amount is only 45 mg isoflavones – a bit more than a single cup of soymilk!
“Women taking soy isoflavone tablets to alleviate hot flashes and prevent bone loss at the time of menopause might want to reconsider,” says Silvina Levis, M.D., the director of the osteoporosis center at the University of Miami’s Miller School of Medicine.
A recent study published in the August 2011 issue of the Archives of Internal Medicine examined 248 menopausal women over a 2 year period to see if 200 mg of isoflavones per day were a help in alleviating the symptoms of menopause including bone loss.
200 mg per day is equivalent to twice the highest intake through food sources in typical Asian diets.
At the end of the 2 year period, women taking a placebo versus women taking the isoflavone supplement showed no differences in bone loss or menopausal symptoms such as hot flashes and night sweats.
In fact, nearly half (48%) of the women taking isoflavones experienced hot flashes compared with just 31% of women who took the placebo!
Yes, you read that right. Soy actually makes hormonal problems worse, ladies! Even worse, soy consumption causes precancerous breasts over time as identified via breast thermography imaging.
Stay. Far. Away.
Studies Showing That Soy Messes Up Your Hormones
Soy Wake Up Call #1
A 1991 study found that eating only 2 TBL/day of roasted and pickled soybeans for 3 months to healthy adults who were receiving adequate iodine in their diet caused thyroid suppression with symptoms of malaise, constipation, sleepiness, and goiters (Nippon Naibunpi Gakkai Zasshi 1991, 767: 622-629)!
Still think munching on edamame is a healthy habit?
Soy Wake Up Call #2
Six premenopausal women with normal menstrual cycles were given 45 mg of soy isoflavones per day. This is equivalent to only 1-2 cups of soy milk or 1/2 cup of soy flour! After only one month, all of the women experienced delayed menstruation with the effects similar to tamoxifen, the anti-estrogen drug given to women with breast cancer (American Journal of Clinical Nutrition 1994 Sep;60(3):333-340).
Soy Wake Up Call #3
Dietary estrogens in the form of soy foods were found to have the potential to disrupt the endocrine system with the effects in women similar to taking the breast cancer drug tamoxifen (Proceedings of the Society for Experimental Biology and Medicine 1995 Jan;208(1):51-9).
Soy Wake Up Call #4
Estrogens consumed in the diet even at low concentrations were found to stimulate breast cells. The effect is much like the pesticide DDT which increases enzymatic activity leading to breast cancer. (Environmental Health Perspectives 1997 Apr;105 (Suppl 3):633-636).
Soy Wake Up Call #5
The soy isoflavones genistein and daidzein appear to stimulate existing breast cancer growth indicating risk in consuming soy products if a woman has breast cancer. (Annals of Pharmacotherapy 2001 Sep;35(9):118-21).
Soy Wake Up Call #6
Direct evidence that soy isoflavones genistein and daidzein suppress the pituitary-thyroid axis in middle-aged rats fed 10 mg soy isoflavones per kilo after only 3 weeks as compared with rats eating regular rat chow. (Experimental Biology and Medicine 2010 May;235(5):590-8).
Soy Bottom Line
In conclusion, soy messes with your thyroid and disrupts the delicate balance of breast tissue and it doesn’t take very much soy at all to start the snowball down the hill to hormone imbalance with only a cup or so of unsweetened soy milk per day representing a significant risk.
Think you don’t eat much soy?
Next time you go shopping, just for grins check the label on everything you buy.
Soy is in EVERYTHING!
The scary truth is that if you eat processed foods (even organic), you are eating plenty of soy. Worse, you are probably consuming far more than you know even if you don’t drink soya milk or eat soy protein bars.
If you are still unconvinced and need more information, check out this article on the over 170 studies on the adverse effects of soy isoflavones from 1950-2010.
Sarah, The Healthy Home Economist
Soy No Help for Hot Flashes, Bone Loss
Studies Showing Adverse Effects of Soy Isoflavones
Hi. I had been reading posts from the FDA and other reliable sources concluding that soy isaflavones were not only safe for women who have had breast cancer / hormone-therapy induced menopause but seem to reduce the likelihood of a cancer recurrence.Both chemo and hormone therapy had not only destroyed my once ‘crowning-glory‘ but have left my joints in a terrible state, so I felt it was worth a try. My hot flushes were at least far behind me though. I’ve now been on the supp. now for about 3 weeks and have been getting extremely clammy hot flushes again. (Too soon to see if my hair will rally though). I started to wonder if the soy might be to blame. I’m no scientist but speculated that maybe it works by ‘reversing’ the menopause process…i.e. meaning that you have to go through that bit too to get to the pre- menopause point where you look and feel yourself once more.. Now I‘ve read this though and I think there’s definitely an unfortunate link. I think I’ll at least reduce the dose just to see if it makes a difference and if it does will probably cut it out altogether. At least I tried.
Sarah Pope MGA
Here are some tips from my primary care MD on preventing hot flashes. https://www.thehealthyhomeeconomist.com/these-things-bring-on-hot-flashes/
Try seed cycling, magnesium and maca . The problem with Americans is they go to extreme. They don’t understand serving size. Soy in moderation is fine or good for you. The extreme of NO SOY is just as silly as soy everything.
Sarah I was taking soy supplements but stopped since reading this blog. The soy was not helping but made matters worse. Is there anything you recommend for hot flashes/night sweats and if so what amount? Thanks
This article describes the best way to wrangle hot flashes under control according to my holistic MD. https://www.thehealthyhomeeconomist.com/these-things-bring-on-hot-flashes/