Answer:
Something we eat, and misspell as meet.
Other terms for this handy device include doohicky, doo-dad, and whatchyamacallit.
What pulls you down and never lets go?
Sitting down you have it, Standing up you don't.
I am the first you ever saw, what greets you every morning and what goes out in the end.
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.