Maybe make Cornmeal an ingredient where the bread is required and a "emergency food" (+10 food/-10 water/no health).
Cooked Cornmeal (Polenta) in a common food here in Brazil and could take the Corn Bread place to no copy Corn in the Cob value.
Cooked Cornmeal (2 meal/1water - 15 food/10 water/10 health/10 stam)