What's the Difference Between Whey and Soy Protein?

The primary difference between the two is what they are made of. “Whey is animal-based protein, and soy is a plant-based protein, so if someone has a milk allergy or is vegan, they are limited to soy,” Collingwood says. ... Also, in terms of texture, it can be “a little more coarse and not quite as creamy as whey protein.”

What's better whey or soy protein?

The latest research says whey protein is a better choice if you want to shed fat, pack on muscle, and boost testosterone. If you want a plant-based alternative, soy protein isn't necessarily a bad choice. In fact, the FDA states that it's better for your heart health than whey.

Why is soy protein bad for you?

Soy, it turned out, contains estrogen-like compounds called isoflavones. And some findings suggested that these compounds could promote the growth of some cancer cells, impair female fertility and mess with thyroid function.