Do human or elven prisoners die of thirst or starvation?

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I know that goblin prisoners don't die from thirst or starvation. Do humans or elves die from them?
I'm curious because when I first chained an elven diplomat, she had the description She is fat
. After a week and a half, I checked up on her and her description says She is average in size
. She also turned berserk.
Is there a way to force feed them so that they maintain their original body size, and also to keep them alive in my dungeon forever?
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