For the food that you cook, do you have a per meal or per day budget?

I found it interesting to read the Budget Bytes September Challenge that totaled out food costs. I know our monthly budget of over $500 is extreme but I wonder how much is waste or snacks. Besides just trying to "cut back" I would like to know what is reasonable to spend on a "meal". For us a Meal serves 4-6 people (Dinner for the family of 4 plus a lunch or two).

http://www.budgetbytes.com/2015/10/september-challenge-week-4-and-month-summary/