I am 80 years old. I am having type 2 diabetes from 30 years. I am taking 30/70 biphasic isophane insulin injections 40 units before breakfast, and 20 units before dinner. My post dinner blood glucose level is 268 mg/dl, and it gets reduced to a fasting blood glucose level of 91 mg/dl after about 12 hours. Does this variation causes diabetes complications in future. However, I do not have any diabetes complications till now.