let's say you find out that the most revolting thing you can ever imagine happens to be the main ingredient in your favorite food or drink. for example, beer had elephant urine in it, or chocolate chip cookies were made with turkey testicles. would you still eat or drink it?

I think so. I once had a friend tell me they use 'laundry detergent' ingredients in my fruit roll-ups. I still eat them (at least when they're on sale)

A lot of fruit roll-ups actually have a soapy aftertaste.
And no, I wouldn't eat it.

unrelated, my instant oatmeal cinnamon roll flavor tastes like a mouthful of sweet potpourri.

It would really take a lot to make me stop drinking beer. I guess it would depend if the ingredient was harmful. If elephant waste was very harmful then I would stop, but if it didn't change the taste (and a lot of people think it tastes like elephant pee already) then it wouldn't stop me (and, yes I am aware of the irony in discussing a hypothetically dangerous ingredient contained in alcohol).

They actually sell these at Coors Field. They're called 'Fowl Balls.'

a vegetarian i know was told that a bowl of these were large lima? beans (known as "foolim"). it was only after she took a bite and spit it out that she was told what it really was.