Poor people have it. rich people need it. if you eat it you die. what is it?

Oh the answer is nothing. Poor people have nothing. Rich people need nothing. if you eat nothing you die.

Hey there!

The answer is nothing. 

If you think about it, many poor people are living with very little or nothing every day. On the contrary, rich people buy so much with their wealth that they don't need anything else. If you eat nothing, you will eventually starve to death. 

Hope this helped you out! :-)