how much of what you eat is canned/frozen/processed/packaged?
i know i eat a lot of canned/frozen/processed(not so much) foods because they are cheaper than fresh ones. (at least that applies for where i am) and opening a can of tomato sauce is so much quicker than maker your own =P
even for fruits, i sometimes buy frozen ones too. when they are cheaper than the fresh stuff. or when the fresh ones become unavailable...