Answer:
What contains zero calories, but if you consume it, you will probably gain weight?
I am whole but incomplete. I have no eyes, yet I see. You can see, and see right through me. My largest part is one fourth of what I once was.
When the son of the water returns to the parent, it dies. What is it?
Often held but never touched. Always wet but never rusts. Often bits but seldom bit. To use it well you must have wit.
Walk on the living, they don't even mumble. Walk on the dead, they mutter and grumble.
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.