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No idea on the cause and no family history for her, she was from the local rescue. Keto was in the zeitgeist at the time. I had looked at it for weight loss, but in learning about it, found that it has been advocated for epilepsy well before insulin was readily available. I thought I was using a decent cat food before, but it had a bunch of grain in it, which cats obviously wouldn't eat in the wild. So it was essentially a cheap experiment that worked out. I consulted with my vet on it first and they basically said, why not give it a try?

This may not apply, but I think it's worth trying. The Keto diet was originally used to treat seizures. My cat developed seizures when she was about 1 and had them for years. Medication took care of most of it, but she still had them occasionally. I didn't go full Keto with her, but got her a different food with no grains and that helped to the point where she was able to get off medicine and still had no seizures. It's possible she aged out of the seizures too - but a diet change is an easy thing to test.