Soy products such as the raw beans, tofu, soy milk, simulated meat products, soy ice cream, soy cheese, soybean oil, and soy baby formula and more are highly processed products that are known in research to be linked to breast cancer, thyroid disorders, intolerances, infertility, digestive complaints, and more adverse health effects.
Some might argue that Asians have been eating soy products for a long time and they have very long life spans. That may be true, but they don't eat very much soy, and when they do it's mostly fermented soy, a natural process which is needed to get rid of the anti-nutrients, oestrogen mimicking chemicals and natural toxins found in soybeans. Fermented soy products that are good to eat include tempeh, miso and natto. Also, Asian cultures have different genetics to many other cultures, and can perhaps handle soy better...
The problems with soy and soy products are many:
1) Unfermented soy products interfere with normal thyroid hormones (which controls metabolism), thus slowing down your metabolism making you put on weight as fat.
2) In most women. soy also enhances the effect of the oestrogen (ie female) hormone, causing a range of issues with the female menstrual cycle and therefore reproductive problems, infertility and an increased risk of female hormone related cancers such as breast cancer, cervical cancer and more.
3) The oestrogenic (female hormone mimicking) effects of the phyto-oestrogens in soy have a greater effect In men, to also affect fertility, increase fat production and create man-boobs, cause enlarged prostate gland, and over time, prostate cancer.
Soy may only help a very small number of people - such as those with oestrogen excess, in women and men. In this case, its phyto-oestrogens can block some of the oestrogen receptors on cell walls, to have a reducing effect of having high oestrogen levels.
Over 95% of the world's soy is genetically modified to survive being sprayed with the RoundUp/glyphosate herbicide which would otherwise kill the plant. Hence the soy products contain this toxic chemical which is a "probable" carcinogenic, according to the World Health Organisation in 2015. There have been a couple of very high profile lawsuits against the Roundup manufacturer Monsanto recently, after victims proved that the herbicide caused their terminal cancers.
In addition to the hormone-affecting issues, soy products can bind to many minerals in the meal to prevent the absorption of those minerals such as calcium, zinc, magnesium, manganese and iron! Frequent intake of soy products can lead to deficiencies in these minerals, which results in many health issues and symptoms.
As most processed or prepared foods found in the supermarket contain soy products, it's best to look at the product ingredients and also avoid those that contain soy.