I'll go on and on about this to anyone who will listen - you are what you eat.
And what you eat is what it ate. So you are what you eat ate. It gets zany quickly, I know.
But here to back it up - it tastes better and is better for you too.
Which is why I purposely look for milk, cheese, and butter from grass-fed cattle.
Oh, and the fact that if I don't, strange things happen. Like the allergic reaction when I bought a different milk. Some might say that I shouldn't be consuming dairy products at all. Maybe they're right. All I know is that I'm fine when I'm consuming dairy from cows who ate what they were supposed to eat. And I'm okay with that.