There is overwhelming evidence that the microangiopathic complications (retinopathy, nephropathy and neuropathy) of diabetes can be minimised, prevented or improved by optimal blood glucose control. There is little evidence to show otherwise. This paper reviews evidences to demonstrate that poor diabetic control predisposes to diabetic microangiopathy. The only way to minimise diabetic microangiopathy is to avoid hyperglycaemia and achieve euglycaemia for most part of the day. In doing so the dangers of hypoglycaemia must be clearly recognized and avoided.