Over the last fifteen years have had to go on Metformin to control insulin resistance, have had to start on thyroid treatment, and other age (and possibly diabetes) related issues.
Funny enough convincing medical people (and others) that years of diabetes is not my age happens more and more often (I was diagnosed age two). I've also found many medical people telling me I'm too old to have type 1!! [I always ask them how old I had to be to outgrow it all together)

Crazy seeing this question today!! Yesterday hit 23,000 days type one, Nov 9 I'll have 63 years.

My insulin doses have increased slightly. I gained weight going through menopause, so insulin resistance from the extra weight/fat could be to blame. I say this because as I slowly lose the weight my insulin needs decrease. So, I am confident that this is the cause.
As for my diet, I eat just about everything. I do try to limit high calorie dishes except on special occasions, but I have always done this. I eat plenty of fruit and veggies, legumes, and low fat meats. I love cheese of all kind and whole grain breads - - the more fiber the better!
I have no cognitive issues.