This is 100% correct, and you can’t fake it. As a medieval historian, I see so many people try to outsmart this trap by talking about “trade” or “taxes,” but because they didn’t really learn it they modernize things far too much and in ways that flatten the world and make it less interesting!
David J ProkopetzTo write in the classic high fantasy mould, you need not be hung up on food specifically, but there must be SOME very mundane thing you're sincerely interested in and prepared to describe in excruciating detail every time it comes up. Clothing. Furniture. Architecture. It doesn't work without it.