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I always lack of food supply for the last 20 min. Is that the norm?
It's not unlikely. Your villagers can go quite a long while without food, although their health will take a drop. Once you have food coming in again you can make a stew to restore them. Remember that in olden times the end of winter, just before the crops came in, was a hungry time for the farming people up until comparatively recently, and still is for millions in places like Africa.
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