I lost my cat last weekend. He lost weight until you could see his backbone and hip bones. He had diabetes. Signals of the disease for him were, drank lots, urine is sticky, urinated way too much. We pumped him up with a few pounds but after six months of twice daily insulin shots and begging him to eat we think he had a stroke. I force fed him many a day. My daughters cat also has diabetes. He is a chub. Guess that disease can go either way. Vet is the only answer.