Plan out your meals in advance, make a grocery shopping list and stick to that list when you're shopping.
And though it may be a little more trouble, double a recipe from time to time so you can freeze part of it for another day. Buying in bulk is often cheaper.
Registered dietitians recommend filling half your plate with fruits and veggies and buying ones that are in season is often cheaper.
Fill the other half of your plate with whole grains and lean meats. And if you want to save a little on that meat.
Controlling portion size is another way to help your budget. Experts say if something is in front of us we tend to eat it even when we're full. So, try using smaller plates.
Finally, save going out to eat for special occasions. Dining out is almost always more expensive than cooking your own. And if you get tired of doing all of the work, get the kids to help.