Answer:
I'm a type of pizza that is folded in half before cooking to contain a filling
The more you take, the more you leave behind.
A mile from end to end, yet as close to as a friend. A precious commodity, freely given. Seen on the dead and on the living. Found on the rich, poor, short and tall, but shared among children most of all.
Although my cow is dead, I still beat herΒ What a racket she makes.
Each morning I appear to lie at your feet, all day I follow no matter how fast you run. Yet I nearly perish in the midday sun.
I will disappear every time you say my name.