Gollum, I am not

I was in a fast casual restaurant and there was a riddle posted near the order counter:

WIN A FREE DRINK!

"What is greater than God, more evil than the devil, the poor have it, the rich need it, and if you eat it, you'll die?"

I thought and thought and didn't know the answer.  But I bet I knew someone who did.  I asked the guy behind the counter if I could make a phone call a la Who Wants to Be a Millionaire.  Sure, he said.

I didn't even finish asking the question before he gave me the answer.

"Nothing."

All hail Antonio, who earned me a free Coke!