Do you like to cook? I've found that meal planning really helps me. When I don't plan I tend to spend too much on food because then it's just too easy to eat out, and that gets expensive. I just went through a couple of weeks where I didn't plan and spent a fortune at restaurants.

I plan out what recipes I'm going to cook for the week and stick to it. For example, last night I made a whole chicken with a couple easy (and cheap) side dishes. Tonight the leftover chicken will be turned into a pasta dish, which will likely yield leftovers for the next day. I have about 3 meals planned after that. I look and see what is on sale and try to plan recipes around that. It takes a little time but is so worth it.