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Wild cats fast. House cats should not fast. There’s a devil in the difference that makes it more dangerous for house cats to go without eating. Their bodies aren’t as adept to using body fat for energy and can easily overwhelm the liver’s ability to handle those byproducts. A month without eating is way too long! Especially because cats have a low thirst drive and get most of their hydration from food. Another reason why wet food is so much better than dry. A better rule of thumb is that a cat is in danger of fatty liver if she has been eating less than half her regular calories for more than two weeks. But...fatty liver can set in much quicker than that for some cats—as little as a couple of days. The longer a cat goes without eating, the sicker it may feel from the byproducts making it that much less likely the cat will restart eating on its own. You must step in now and help her eat until she can eat again on her own. Poor nutrition = poor prognosis no matter what she might be working through.