I'm not completely sure, but I think I spend about $200 per month on food right now.
If I eat mostly rice and potatos, I live on less than $100 per month. If I eat more variety, and base it on corn and potatos instead of rice, I spend closer to $200 per month. If I really increase the variety, and through some blue berries in, it climbs to probably $300 per month. It would be easy to go higher than that if I really got picky. I'm mostly vegetarian.
How much do you spend per month, and how much is from restaurants? When I eat out, I eat bean burritos, which are 400 calories each and $1.08. 6 or 7 per day would take care of me.
If you always eat out, and your average meal is $15 after tax and tip, and you eat 3 per day, 30 days per month, that is $1350 per month. $450 per month if the average meal is $5.
And count booze and soda and candy. Anything with calories.