I think we must spend a lot less these days, our weekly shop is anywhere from £30 - £50 depending on whether we're stocking up on meat ect. and we may do a £10-£20 top up during the week as well. However before we used to go shopping a few times a week spending between £20 and £40 each time. We'd be eating a large bag of crisps plus some chocolate and or cakes each evening which all adds up.
Even if it does cost more to eat healthy, I actually really couldn't bring myself to buy the unhealthy cheap food now. I actually couldn't eat like that. But to be fair I think we used to be quite expensive unhealthy eaters in the first place, we used to buy enchilada kits which are quite expensive, have loads of cheese and garlic bread with everything we ate. Yes we used to buy the cheap ones, but when your having them everyday again it all adds up.