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How about if your villagers is in danger of food shortage they will work harder than they nomally do until they have enough foods



Actually, what the villagers do now is fine, since they work steadily until they have enough food to "fool around" (i.e. look at the rock, look at the ruins, push the boulder...) If you had little to no food, you'd want to conserve energy to keep your health, not work harder and use more energy, which would require more food to replenish.