This thread is actually over FOUR years old, not three. And yes, forts do help with starvation penalties. So does devastating enemy tiles, although you need to be in a different tile each turn, because you can't devastate already devastated tiles. Logistical traits seem to help, but I am not sure on exactly how much. Generally, if you're campaigning through the winter, you should build a fort in the winter, and devastate fertile tiles in the spring-autumn. If you're besieging a city over multiple turns, or even years, then you need to understand that your men would be having trouble foraging just as the enemy would be starving inside the walls. Starvation in EB is a rather mild morale penalty, because the engine's limitations don't allow for supply trains to avoid starvation, or for proper attrition. Nonetheless, a 3 morale penalty is still significant enough to make you want to avoid it, if at all possible. Especially for Celtic factions and the Qarthadastim, they don't have much morale to spare usually, and -3 can sometimes be a 25% increased chance to rout when your units only start with 10-13 morale.