MRLIMO-

As one "Mister" to another "Mister", I believe* at McDonalds in the beginning (of the day) you can purchase an EGG-based cholesterol thingee. You cannot purchase a CHICKEN-based thingee until much later in time. Good enough answer for me.

I believe this should nicely answer the eternal question you refered to.

* I have not actually done this in person