Question

A natural state, I'm sought by all.

Go without me, and you shall fall.
You do me when you spend,
and use me when you eat to no end.
What am I?

Answer 1

Gluttony. What motivates us naturally as humans is what makes us happy; when we forego the use of things that make us happy we fail because we have no motivations. The author uses the example of shopping and and eating. Someone who shops excessively is being gluttonous, as with someone who is eating.