Try this. Make a piece of armor that give a health bonus, put it on your thrall, watch them grab food from the pot. The research I have done shows it’s as RNG as anything else in this game.
I’ve had thralls take jerky out of the dryers, load up on rotten food; but not for awhile, load up on food till the pot is empty, never take food, only take food when they take damage. Which is actually the way it is supposed to work.
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