Riddles about nothing

It is greater than god, more evil than the devil, the poor have it, the rich need it, and if you eat it, you will die? What is it?

What does man love more than life, Fear more than death or mortal strife. What the poor have, the rich require, and what contented men desire. What the miser spends and the spendthrift saves, And all men carry to their graves?

Poor people have it. Rich people need it. If you eat it you die. What is it?