Replacing cow milk with soy milk will decrease the amount of calories, saturated fat, and mammalian estrogen you consume.
The phytoestrogens in soy are nowhere near as potent as mammalian estrogen in humans. Studies looking at soy consumption show that moderate amounts have no statistically significant impact on free or total testosterone.
If you have acne problems, replacing cow milk with soy milk will lower skin follicle inflammation and sebum (over)production, thus reducing or removing the acne.
There is no magical weight loss property in soy, but if you're already drinking cow milk, swapping it with soy milk would be a step in the right direction.
