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This is what I found -

It is “conventional wisdom” that hypoglycemia in the feline diabetic is to be feared more than any other eventuality. Thus, most traditional protocols perpetuate the patients’ diabetes because maintaining a patient’s blood glucose in the range above normal (greater than 120-150) insures that the cat will never recover from its disease. While hypoglycemic seizures are to be avoided, no question, it is not necessary to keep a patient’s blood glucose above 200mg/dl, or even above 150, to accomplish this. Through its evolved physiology, the cat prefers to function at blood glucose levels below 100! In fact, if we could test our healthy patients without the stress of the hospital environment elevating their blood glucose levels in our clinics, we would realize that most cats are perfectly happy with levels around 60-100! In nature, most of the cats’ blood glucose is glucose produced by its liver from protein amino acids on an “as needed” basis. Large sugar surges from dietary carbohydrate intake, well tolerated by omnivores and herbivores, are essentially unknown to the cat in the wild setting and are clearly unwelcome as well.