Hello Nof!
I haven’t read the book, with much interest I will take a look at it. I can explain my opinion about why I don’t think soy is a dangerous ingredient in our products.
First of all, soy contains compounds that look like hormones (http://lpi.oregonstate.edu/mic/dietary-factors/phytochemicals/soy-isoflavones). We are talking about phytohormones, which in soy, are isoflavones. These isoflavones are a bit like estrogens, and could bind to estrogen receptor. But, these fyto-estrogens are much less effective than that of hormones.
I would like to refer to a review study (http://jamanetwork.com/journals/jama/fullarticle/2529629) in which 62 researchers have been reviewed about plant-based hormones. Co-author Dr. Trudy Voortman: “Our analysis shows that many studies have been conducted on plant therapies and menopausal symptoms. However, the quality of most of these studies is not very high. For example: the number of women included was relatively small. If we take the results of all available studies, it appears that women taking supplements containing 10 to 100 mg isoflavones or phytoestrogens have about one hot flash less per day than women taking a placebo.”
There has been an event in which a herd of sheep in Australia became almost totally infertile because they grassed in red clovers fields. The red clover also contains fyto-hormones. But in this case, the amount they got from fyto-hormones is comparable to eating a whole pot of soy-based food supplements per day.
Next to that, there are a lot of studies in which they compared men who took fyto-hormones to men who didn’t take supplements. They checked the quantity and quality of the sperm and the amount of testosterone from both groups, no difference was found.
So I’m quite convinced our products do not have a sufficient influence, but I don’t deny that plant based hormones can’t have any influence at all.