@CloudyMrs@histodons@ASECS now I'm unsure if we're talking about the same thing? I'm looking for general books and articles by (for the most part) food historians who've written on attitudes to food and eating in the eighteenth-century. And not so much what people actually ate, more about what different groups of people thought people should eat or not eat, and why.
I reckon those historians will have synthesised a wide range of source material that either directly talked about food (in the big centres of population) or mention it in passing (making value judgements about it) and even some material to make good guesses or generalisations for certain regions. That said, I agree with what you say that it was likely locally more varied then (as is certainly the case in my home country) and that it is unlikely anyone wrote about the very small or remote areas.