The cows probably read and believe the blurb on the packaging stating how healthy the food is, without actually checking out the ingredients.
Dh and I have been lectured by our doctors to start paying more attention to what we eat. It's no longer viable to think "yeah, I'm young, my body can take the food abuse." At first, we looked at the promising words on the front of things like Quaker Oats and Special K, then we turned the box to the narrow side and started reading how many grams of protein, fiber, etc is contained within. Talk about a bunch of BS.
I bet the moos could probably walk to the next bus stop, rather than taking the closest one to their door, and burn a few calories, too.