I think a lot of people don't realize how cheap food can be. I average $400 - $500 a month on food, and I buy for myself and my girlfriend. We eat steak, fish, chicken, meatballs, something good every single night. I never even look at prices in the grocery store, I just buy whatever it is I want to buy and it comes out to that amount. If I could spend $800 on food at the grocery store in a month I wouldn't mind, I just don't know what I'm missing out on. The only thing we don't do is go out to eat, or drink much.
We went out for our anniversary the other night and blew $100 on a dinner for two, for a meal I probably could have made myself if I had put my mind to it. That was the first time we ate at a restaurent in probably 3 months, and it was 20-25% of our monthly food budget for 1 dinner. I enjoyed my food but I couldn't help but think, I could eat filet mignon every single night this week and it would be just as good for this same amount of money.
Not to mention the $10.50 martini that cost them $1 to make, or the beer I had that cost more than a six pack of nice local beer.
So don't eat out, learn how to cook, and suddenly $5-15 a day is plenty to eat like a king.