I have had Type I Diabetes since 1988. I have been pumping Humalog since 1998. My hemaglobin A1C tends to be in the 5.5 – 5.9 range. I have had A1Cs as high as 6.3 and as low as 5.4, not counting my long honeymoon period.
The reasons to maintain tight control and to improve whatever level of control each of us has have to do with the Diabetic Control and Complications Test (DCCT) that was performed years ago. That long term test of varying levels of control proved the intuitively obvious. Better control reduces diabetic complications. It also quantified it. Those in the tight control group saw a 50% reduction in all diabetic complications except one. For retinopathy the reduction was 60%. Tha’s a 60% reduction in the chances of going blind. That’s huge. It also proved that it was not a simple tight control yes or no type question but that improvements in control at all levels reduced risks of complications. So, that’s some serious incentive for maintaining the tightest control we can, whatever that is for each of us.