It has been reported that taking soybean based dietary supplements for periods longer than six months may be unsafe. Taking high doses for longer period might result in abnormal growth of tissues in the uterus. Higher dosages during pregnancy might harm development of the baby.
Also, soymilk is not a substitute for infant formula. It cannot be used as an alternative to cow's milk also. Regular soymilk may lead to nutrient deficiencies in the children.
It is reported that the soy products may increase the chances of kidney stones as they contain large amounts of chemicals called oxalates. People with a history of kidney stones should avoid taking soy products in excessive quantities. Also, it should be avoided in case there is a history of bladder cancer or a high risk of getting it i.e. having a family history of bladder cancer.
Excess quantity of phytoestrogens, a chemical present in soybean is associated with the cases of kidney failure.
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