We eat mainly local - not 100% or anything, and I don't worry about it enough to even track how much. But all of our meat (which is not much) and all our vegetables and much of our fruit (we still buy bananas, which are not local to Massachusetts, plus we buy citrus in the winter - otherwise all local fruit, and we're still eating apples we picked last fall).
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Have been doing it for 2 full years. Our vegetable CSA makes it so easy for us to eat in winter, because they have a winter CSA. We eat from their root cellar, plus they grow some greens in the hoophouse. It's not even difficult for us - it's more like we look forward to summer vegetables than truly miss them.
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Though our CSA does the root cellaring work for us, I have started doing some preservation of summer vegetables. Not much for the 2010 harvest year (all dehydrated stuff - mainly a half bushel of tomatoes I dried, which is actually enough because I'm the only one who eats tomatoes for anything other than sauce - plus a shocking amount of hot peppers, and some this-and-that veggies like zucchinis and such that I dried to drop into soups). But I'm getting a pressure canner for Christmas! And have plans to try to can at least 50 pints of tomato sauce for 2011, which is a start. Plus plenty of other things, including taking a stab at jams and just fruits (peaches mainly), applesauce, broth (yay! I'll finally have room for all the broth I can make! I hate store broth!), some corn and just some experiments with a few other things to see what we like.
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My personal feeling on expenses is that fruits and vegetables are competitive price-wise with the organic stuff at the store overall. Some specific items might be a little more expensive locally (but not much)Â and others are actually cheaper. It also depends on quantity - buying a half bushel of canning tomatos was a major steal, for example. Animal products (meat, dairy and eggs) are more expensive in every case. And grains are also more expensive. So I would advise anyone wanting to start out to stick with vegetables and fruits and go from there. For me, the major thing I want to do is switch away from factory dairy - we rarely eat local dairy (due to $$, nothing else) and we eat a LOT of factory dairy (cheese, mostly). For this to be realistic, I think we'd have to actually reduce the amount of dairy we eat, change our diet. Since we never ate factory meat before, we didn't have to deal with that diet change - we rarely eat meat (for $$ reasons) and ONLY buy local meat when we do. So the dairy part is our major challenge. And I want to do it, not because I'm stuck on the local label, but because I do not feel ethically ok about factory dairies.