The legal requirements for driving differ in different countries, but most insist that you notify them of any illness that may impair your safety as a driver. For example, the old British driving license states:
You are required by law to inform Driver and Vehicle Licensing Centre (DVLC) … at once if you have any disability which is or may become likely to affect your fitness as a driver, unless you do not expect it to last for more than 3 months.
The new license mentions diabetes specifically. The DVLC is now the DVLA. Drug-treated diabetes counts as such a disability because people on drugs which lower the blood glucose (this includes insulin) are at risk of hypoglycemia and confusion or coma. It can be argued that any form of diabetes counts because of the theoretical risk of hyperglycemic como, or the later need for glucose lowering treatment, or because some of the complications of diabetes may make driving unsafe. To adhere to the letter of the law, even diet-treated diabetics should inform the DVLA of their diagnosis, clearly stating that they are not taking blood glucose lowering drugs at that time.
It is your responsibility to notify the authorities and not your doctor’s. The licensing authority may then request details of your condition from your doctor who can release them only with your consent.
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DIABETES
