
The Soybean, or Soya bean as it's know in the UK is a species of legume native to to the Eastern parts of Asia. The use of soy in the UK has increased significantly since the 1980's and it's very likely that you will find it in the majority of processed foods stocked in your local supermarket. On top of that Soy is heavily used in both vegetarian and vegan diets in the form of Tofu and quite often used as animal feed. As for whether our paleolithic ancestors consumed soy, the likelihood is very low, mainly due to the fact that the soybean must be processed to make it useful.
Phytoestrogens
Being male, one of the main reasons I stay as far away from soy as I possibly can is because they contain high amounts of phytoestrogens, which mimic oestrogen in the body. Oestrogen, which as you may know is the primary female sex hormone, whilst required by men in small doses it can cause the formation of breasts, raised cholestorol, weight gain, osteoperosis, enlarged prostate and in extreme cases infertility if over-consumed. Another thing worth mentioning is that ancient monks were known to use Soy to reduce their sexual desires.
For the females reading this thinking that it doesn't affect them, think again. I think the fact that Oestrogen is the primary ingredient in a lot of birth control tablets should be enough to put you off over-consumption. It's also worth mentioning that 80% of breast cancers rely on supplies of oestrogen to grow.
Processing and Genetic Modification
As I mentioned earlier Soy requires processing to make it safe for consumption. Some of the processes involved sound pretty extreme like acid washing and the use of neutralisation solutions. On top of that you need to consider what is added in at the processing stage to improve the flavour. The likes of MSG are very high on my avoidance list and I feel it deserves an article of its own, but to be brief it's very bad news. Adding to the apparently about 91% of the Soy grown today is genetically modified, which opens up another can of worms worthy of a separate article.
Mineral Absorption
Soybeans have really high levels of Phytates, which are guilty of blocking mineral absorbsion, specifically minerals such calcium, iron, magnesium and zinc. All of which are required by your body to keep it running properly.
Finally...
Whilst it's pretty obvious that Soy has quite a lot of negative effects, if you must have something soy based, fermented products such as Miso and Tofu is probably your best bet, since the fermentation process makes it a little better for you. However, I choose to avoid it completely where possible, including eating meat reared on soy feed, and doubt you could convince me otherwise!
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