On one of my game I lost half my population after the second half of winter, which is a harsh but understandable lesson.
On a subsequent game I began to have trouble feeding my population even in the first spring, and I really don't understand why.
One of the thing I've done differently in the last game is marking all the food on the (skirmish) map as good for harvesting. Was that a mistake? I see the workers travel across all the map to collect them, should they be tending their crops instead? And why if that's the case can't they prioritize their work correctly?