Mia - Your black & white cat looks exactly like a cat my wife has. Our kitty has diabetes and requires 5 units of insulin twice a day.
Charlie was also diabetic and received two shots of insulin per day. Think he may have been diabetic from birth, but it wasn't identified until he was about ten years old. Afterward he had insulin injections for nine years. He also had pica, where he ate things that were not food, like paper, erasers, and rubber. Wonder how common diabetes might be in tuxedo cats?