Answer:
I am commonly ate before I'm born and after I'm dead.
The faster you run the harder it is to catch me
Men seize me from my home tear apart my flesh drink the sweet blood then cast my skin aside.
I am a protector. I sit on a bridge. One person can see right through me, while others wonder what I hide. What am I?
My teeth help me suck.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.