The theory is that an enzyme present in the soy plant is frighteningly similar to the female steroid estrogen, and it can produce the same result. This has several effects:
It can be damaging to the endocrine system of children who use soy formula.
It can cause very young women and little girls to enter puberty earlier.
It can cause men to produce less testosterone which is a VERY bad thing. Low testosterone levels are associated with lowered aggression, lower self esteem and confidence, loss of sexual interest, lower sperm count and even penile shrinkage.
The question is to how similar the effect of this plant enzyme and estrogen really are. Some studies demonstrate conclusively that it's bad, while others are not conclusive.
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