idk if this is a bug or what but sometimes i just cant eat an mre? it just says "i dont want to eat that" even when im starving to death. thats the reason i died a few times.
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if you eat too much of only one food then that will happen, try ordering some other things from the shop or the vending machines. buy a knife to cut potatoes, can opener for the cans, or try your luck with mushrooms.
or you can disable it if its too much at the start, its "food tolerance" in the experimental list.