Answer:
My days are numbered.
I have wheels and flies yet I am not an aircraft.
I'm sometimes white but most often I'm black. I take you there but never bring you back.
I have a few points but we're not competing. I'll help you win when you're eating.
People see through me, but none pass through without killing me. I can be anywhere, and can be seen double or single. What am I?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?