Whey, All the Way

While whey and soy are both good as protein sources, soy has a lot of phytoestrogens - plant chemicals that act as estrogens in the body. Some people say that these weaker estrogens help ward off real estrogens like estradiol. Nope, it is not an antagonist of any type and is still a bad estrogen. Thus, I shun soy and only buy products with whey (casein and milk protein are good as well).