Doing a quick Google search, I easily found the following "cures" for diabetes.
If there truly is a cure for diabetes, why don't we hear about it in mainstream media? Many of those things listed might help prevent/delay Type 2, but they won't prevent it for all (especially Type 1) and definitely won't cure a person once diabetes is diagnosed.
Many people misinterpret "tight control" with "cure". My goal is to get my numbers down into the "non-diabetic" range. Would that mean I'm cured? Absolutely not! Once I'm able to eat a bag of my favorite malted milk balls with the nice thick layer of chocolate without my glucose level going through the roof, then I'll say I'm cured.
Image found on a site claiming that bitter melon helps control blood sugar and increases insulin production.