Therefore, the boobies only drink milk and not soya milk every day. In fact, this is a misconception. The phytoestrogenic substances contained in the soy milk we drink everyday are quite low in terms of our overall daily dietary intake. In addition, a large amount of water is added to the soy milk during the production process, which also dilutes the concentration of estrogen to a certain extent, so it is okay to drink soy milk on a daily basis.