I doubt it makes a difference.Tried a whey protein which was three quarters soy for a few months and didn't notice anything.
Men shouldn't do soy or licorice - decreases testosterone
recent study found that men consuming regular cow's milk had way more elevation of estrogen levels then the group drinking soy milk.....soy is fine!! Cow's milk not so much
Perhaps due to the hormones given to cows?
It'll give you boobs. Soy is the transgender way.