I still think it's probably not a particularly "healthy" sign that she's spending more calories than she's eating of her own volition, but it's also probably not abnormal for a cat her age. My 17 year old slowly and steadily ate less and less the last year of her life for no obvious reason. It was the same kind of pattern, with her intake very gradually declining, and her surges of a couple days when she ate a lot became less frequent. There was never anything I could do that kept her appetite up long term, but she managed to happily go about her senior kitty life for a long time anyway even though she was already underweight to start with.
I don't mean to suggest that Feeby's going the same route at all, just that it might be a symptom of old age. (Along with being underweight, my cat had a lot of health problems and poor quality of care for a long time so every day she was alive and happy was a pleasant surprise. Feeby's in much better shape!)
I don't mean to suggest that Feeby's going the same route at all, just that it might be a symptom of old age. (Along with being underweight, my cat had a lot of health problems and poor quality of care for a long time so every day she was alive and happy was a pleasant surprise. Feeby's in much better shape!)