Uncontrolled diabetes can certainly lead to some personality changes. I’ve seen even the sweetest people behave horribly when blood sugar is out of control. I’ve seen marital problems and problems on the job all due to problems caused by uncontrolled blood sugar. There are also many other issues with diabetes and it takes a lot of work to manage it. Diabetes can lead to blindness, loss of limbs and loss of kidney function just to make a few things. Uncontrolled diabetes is a nightmare. So yes, if you find a doctor who has had diabetes for many years and he or she is healthy and active, then you’ve found a doctor who practices what they preach so to speak. There are many illnesses that require a complete lifestyle change to manage in addition to medications. Often there is a stigma associated with mental illness but why should it be that way? Physical illness is no different than mental illness. My point was simply to offer encouragement that if you manage your illness, whatever that illness may be, you can live a full and productive life. We all have limitations but why not strive to be the best we can be.