A day after it revolted it probably wouldn't all that much to emigrate and anyways regions that are nonstarving only do anything if they are in crap conditions too as otherwise there is no room for them to emigrate. Also decimating a region every time a region starves for a day is no good as quick revolts combined with the riots would cause that and it sucks waiting for ever to have a decent region again which is basically why you made this thread IMO.
One thing is quicker, and another in one day!!!... the hunger would hit hard the loyalty of a region... But we are sidetracking.
The thing is the population will be more 'moveable' (faster and/or more numerous migrations), both ways: fleeing when looting or starving, and coming back when things are ok again. And regions wouldn't have a rigid 'top' of population, but an 'optimum'. If you have less population the production is low, but if you have too much, you could have others problems too... maybe hunger, or low control, or would hit morale and/or Loyalty...
A region will recuperate faster from looting or starving, as the population would come back faster and production will be re-established fast. But when things go wrong, the people would left fast too, giving neighbour regions a fast grown in population, it could be good for them, or overpopulate them, with the problems of it.
Maybe the regions could have a 'likeable' code, and people would go to the best, left the worse ones, and flee 'in hundreds' the horrible ones (the ones starving or begin looted).
