I know its still very early, but are there any plans for settlers getting ill from eating a limited diet?
E.g. if your villagers live exclusively on corn, they get pellagra, or if they don’t consume fruit/berries, they get scurvy.
Aside from discouraging mass production of whichever crop has the highest yield, this opens up the possibility for things like droughts/moulds killing off many crop types, raiders pillaging/burning farming areas, or locusts eating all of a certain crop type. Your villagers lose stats from consistently eating whatever few foods you have large stores of.