Big Boy was diagnosed 3 weeks ago.he is on prozinc 3 units a day 2x a day. He only eats wet food. I have used the chart provided here. His weight has dropped from 20 to 10 pounds in less than 6 months. He lost 2 pounds over the last 3 weeks. His fructosamine was 605 yesterday. I am starting to test him daily. I have a feeling that he spikes because his actual blood sugar level at the vets was 120. I am clueless as this is my first cat with this disease.