Myth: Soy is harmful for those who have or have had breast cancer because it contains estrogen.
In 2011, data from the Women’s Healthy Eating and Living study (WHEL) were used to examine the effect of soy intake on breast cancer prognosis in 3088 breast cancer patients who were followed for 7.3 years. As soy isoflavone intake increased the risk of breast cancer related death decreased. This is the third epidemiologic study to report: no adverse effects of soy on the prognosis of breast cancer: it does not counteract with the effects of tamoxifen and it may in fact provide potential benefits in decreasing risk of recurrence or death from cancer.
Soy contains Phyto hormones, which are not the same as human hormones. They are precursors which help to balance healthy estrogen, progesterone and testosterone in humans. To understand this better, please read Phytotherapy: A Safe and Effective Solution for Hormonal Health
Thanks to Health Action Network Newsletter, a group which has worked tirelessly and successfully to help promote natural health awareness in Canada since 1981 – many years. A great non-profit to join! http://www.hans.org/
Please read the soy controversy for more in-depth, which also discusses sources, quantity and more research. For your health, please use only non-GMO soy. This is why it is included as one of the Super Foods in my book: The Paw Paw Program.
Soy has been controversial because most soybeans grown in the United States are genetically modified to resist the herbicide glyphosate.
However, research suggests that consuming soy milk may have several health benefits, such as improving cholesterol and blood pressure levels.
Furthermore, despite claims that soy may increase breast cancer risk because it mimics estrogen in the body, research suggests that soy products may actually reduce the risk of cancer.
Some brands produce organic soymilk, which is made from non-genetically modified organism (non-GMO) soybeans and free from conventional pesticides and herbicides.
Reference:
https://www.healthline.com/nutrition/healthiest-milk#soy
In my opinion, the best is to make your own from organic, no additives, no preservatives, just spices or organic vanilla to flavour. It is very simple and will cost you a fraction of purchased brands, especially if they are really healthy ones. Like anything good for you, do not overdo!