Not sure if this has been discussed before but I was treated for an estrogen positive breast cancer and am getting mixed messages about soy and phytoestrogens. The surgeon told me flat out “no soy at all” and the dietician at the cancer centre is saying “up to three servings of soy per day” - very confusing
@JMS When I had the first meeting with the Pharmacist to go over the do's and don'ts about Letrozole, soy was mentioned. There was not enough studies done to know how soy would react with Letrozole. She asked if I was a vegetarian, no I am not. There may be some products that I eat which has soy but I don't think too much.
@JMS - It's challenging when you get mixed messaging from different healthcare providers on your team.
I thought you might find this info helpful: Eating well after breast cancer | Canadian Cancer Society.
I can understand why you are concerned and don't to do anything to put your health in jeopardy.
You might find it helpful to contact our Cancer Information Helpline for help locating some research studies on the topic that can help further inform your decision. You can reach them at 1-888-939-3333.
Here are a couple of the references for that info with links to the studies:
de Glas NA, Fontein DB, Bastiaannet E, Pijpe A, De Craen AJ, Liefers GJ, Nortier HJ, et al . Physical activity and survival of postmenopausal, hormone receptor-positive breast cancer patients: results of the Tamoxifen Exemestane Adjuvant Multicenter Lifestyle study. Cancer. 2014: http://onlinelibrary.wiley.com/doi/10.1002/cncr.28783/pdf.
World Cancer Research Fund International & American Institute for Cancer Research. Continuous Update Project Report: Diet, Nutrition, Physical Activity and Breast Cancer Survivors. 2014: www.wcrf.org/sites/default/files/Breast-Cancer-Survivors-2014-Report.pdf.
I hope this helps,
Why no flax? I am taking it for fiber and to keep my cholesterol in check. I was told Letrozole can make cholesterol go up. I thought it was a good thing?
Yes, letrozole and anastrozole can make your cholestrol go up. Have you had yours checked? Is it going up? I take psyllium fiber in the form of metamucil.
Did you know that flax is estrogenic? You might want to consult with your oncologist to find out if they are ok with you taking it.
I was told no soy, well flax is equally if not more so estrogenic in the human body. My cancer is estrogen driven. I'm on an estrogen blocker for a reason. Therefore I have chosen not to add any estrogen to my body in the form of parabens, soy and flax.
Reminds me of when I was first diagnosed and wondered if my weight lifting would contribute to an increased risk of lymphadema. Couldn't get an answer.....but now we know that kind of weight bearing exercise is good for you! Information changes of course as new studies etc are done - but it sure can be confusing!!
I agree there are many mixed messages about phytoestrogens and estrogen driven breast cancer.
I prefer to err on the side of caution, as I don't really know if they cause a problem or not. I just figure why take the chance, I'm on an estrogen blocker cause my body has too much of it. It's my choice because the evidence is not conclusive one way or the other.
According to the information from Wellspring phytoestrogen is found in soy, flax, oats, rice, barley, chickpeas, lentils and a whole host of other plant based foods. They say it's a weaker estrogic and is better than the stuff our bodies make.
I've been reading the links posted by @Lacey_Moderator and am thinking that there are no "absolutely for sure" answers, you just have to do what feels right.
I love Soy milk over Oat milk wondered too . Had read not to eat Tofu . But really how much in these parts per million over since you started can this affect you . I think a Oncology Dieticien be best to ask . Or check out your Provincial Cancer Web site she referred me to look at for other dietary concerns like diahrea diet with cancer .