I just published an article titled "Beat the High Cost of Food: Get it Free" on Associated Content.
There are some things I didn't mention there, though... one is that it takes planning and work to get free food, so that it isn't really free. We have to work at anything, whether we work for money and turn that money into goods, or work directly for goods (or food).
It's often more fun or more satisfying to work directly for goods or food, especially if the method is a little out of the ordinary for you. For instance, it might not seem to be much fun for a farmer to glean a field by hand, but for those who sit at a desk all week, an hour or so in the sun and dirt can be might satisfying.
That's just one way of getting "free" food. Pick and choose yours, or use all methods possible.
Just another way to beat the ever increasing cost of food.