It's a well known fact that one way to save money is to plan out your meals ahead of time. It's not always necessary to plan out your week day by day such as: Monday - BBQ Chicken, Tuesday - Pizza, etc. Another way that I use is to simply plan 7 meals for the week and pick and choose which one to eat that day. This works great for us because I don't like being told what I need to eat each day. I like a little flexibility.
You can save even more money if you use foods that are on sale as part of your weekly menu. Look through the weekly sales ads for all your local grocery stores. If chicken is on sale - buy it and use it in a dish that week. If you have a coupon to go with the product even better.
To save you some time I've included a link that has almost all the grocery store ads listed. Just click on your local stores picture to see the current week's sales ad.