I hear yer Lotto (name?) BUT I've even got a ploy for that... I write a good list out beforehand, when I work out the menus, and ONLY buy what's on my list...
I actually enjoy food shopping now, whereas I didn't before, cos on food shopping days I have fresh fish and prawns etc to snack on! Certain aisles obviously I don't frequent (cos they sell food which would block my arteries...), but on the whole I enjoy it cos I treat myself with, say, scallops... the odd pack of frozen gambas... even a lobster near Christmas time instead of the sort of stuff I used to buy. Once in ketosis, fear not, you'll be fine...
I've never online shopped - far too suspicious about their sell by dates (I've read things!)... I always dig far behind to buy my stuff! haaa!