I am new to post but have been following and reading alot. I have a diabetic cat Tigger diagnosed last december. Started on Prozinz 1 unit bid. When diagnosed his sugar was 480. Eventually went up to 5 units 2x daily and was also prescribed diabetic dry cat food. After finding this forum i decided to switch to fancy feast classic line back in September. Blood sugars went down. Able to communicate with his vet by email with curves and such and went down to 3 units bid. Then at the end of October one morning he ran a low. Thank god i was home and noticed and was able to notice and caught it before it was too low itcwas at 62. Lowered his prozinc to 2 units and was spot checking. Then allof a sudden his sugars were back up in the 300 and 400's. Well this past sunday he started to vomit then refused to eat. Took him to the vet monday. He has an infection and pancreatitis. Now in pain meds, nausea meds and amoxicillin and his glucose still running in the 400 to 500's. Doing better and eating now on meds and i/d foods from vet. So my question is or I guess concern is has anybody had problems with fancy feast classis line of foods?? I have read they are high in phosphorus?? Wondering if the food caused this?? Sorry for the long post!