The answer is no. Insulin treatment does not cause an acromegalic cat to go into remission. The diabetes is caused by excess growth hormone from the pituitary tumour. That tumour can ramp up and ramp down. If the tumour ramps down, it is possible the cat will go into remission. There have actually been cases of cats that have acromegaly that were not diabetic. Note that the number of cases of known acrocats to have gone into remission when treated just by insulin, is just a handful. Karen's Lily is one. I can think of one other. There have been a few cats that were diabetic, went into remission, fell out of remission and subsequently later diagnosed with acromegaly. Did they have acromegaly the first time? Who knows, they weren't tested the first time they had diabetes.
Giving insulin, and preferably enough insulin to keep an cat under renal threshold, is to keep the cat's body and internal organs as healthy as possible. Acromegaly by itself is hard on kidneys. You don't want to damage kidneys any more by keeping the cat in high numbers. TR gives you the best chance to keep your cat regulated and allows you to increase faster to get your cat into better blood sugar numbers.
