My cat was diagnosed last week. He has never been obese and he's only five years old. This seems to have came on pretty quickly. Over the past couple months I noticed he was drinking enormous amounts of water and leaving enormous clumps of urine in his litter box. I took him to get checked out. He had lost about 2 pounds since May, from 11 pounds to 9, according to his vet chart. His levels were around 360, which the vet said is high; normal is 170. He was also dehydrated, so for three days, I gave him fluids subcutaneously. He also has a bad tooth, for which he is being given antibiotics. I am hoping to be able to treat the diabetes with diet alone, but all the information I am finding is for treating an older, obese cat. Since I have switched him to all can/wet food (fancy feast classic pate plus the Purina DM the vet gave me) he is not drinking water like he was, and the urine clumps are back to their normal size. Is it possible, with youth and leanness on his side, that diet will restore him to pre-diagnoses? Is it possible the tooth could have influenced his levels and he has been misdiagnosed? Where can I find information to learn more? Thanks!!