Siri, I had the same question and couldn't come up with the answer either. I developed my own answer.
There are a lot of different diabetes "types" - Type 1, Type 2, Type 1.5, Type 3, etc, etc, but regardless of which Type YOU have, it is YOURS. Using this as a background, I then reasoned that in this age of hip, fast-paced, emoticon and texting world, "you" gets shortened to "u" frequently, so ....
type u diabetes