Vital Needs
Vital needs are the category of population needs of the highest priority. They are composed of primary needs required for basic survival: food access and water access.
Without vital needs satisfied, not only will the fulfillment of needs of higher priorities be useless, but your population will die of starvation and stop breeding piglets resulting in a negative Growth and population decay.
Maintaining a good % of vital needs satisfaction is one of the first and most critical tasks to manage your territories.