i live in the southwest, and it's just DH and I. i'm going to estimate that i spend about 150-200GBP a month on food. but i would have to say about 20 of that is me buying new products that i haven't tried (which usually end up being crap anyway).
i would say the majority of what i spend per month is on meat. and i don't buy juice usually...only the odd one here and there (buying juices can get expensive...especially in the US). my estimate also doesn't include alcohol...just so you know.
it's quite easy to get by on very little (money) per month when it comes to food. staple items are usually inexpensive (for the most part) and there is always a super cheap alternative to a product that you might really like (like the store brand of american sliced cheese, cans of veg, etc.) and if you wanna go super cheap...ramen noodles are only .08p at tesco!!