I live in countryside Belgium, eat mostly healthy vegetarian stuff, and avoid big supermarket like the plague. I spend about 400€ during winter and spring. Less during summer and fall, since I grow lots of vegetable myself, although how much vary depending on weather and cats. Last summer I must have spent about 300€/month, while this summer isn't looking good.
But as P1na said, Belgium is freaking expensive. Back when I lived in the French side of the Franco-Swiss border, I spent around 300€/month, with no garden.
If you can, grow your own food. You can do it inside an apartment if you have enough windows, and you'll get food which is as healthy as you want it to be for extremely cheap.
Post edited May 29, 2015 by dksone