In the current era diabetes has become a common disease among people irrespective of age. Diabetes can even cause loss of life if not treated properly. There are different types of diabetes commonly classified as Type I and Type II. In Type I diabetes insulin is not produced properly and in Type II the insulin produced is not utilized by the body properly. In this paper we are considering Type I diabetes, where no or little insulin is produced and as a result sugar builds up in the blood instead of being used as energy in the body. Here PID controller is used for controlling blood glucose by properly providing insulin. The tuning method used is Imc-chien and Imc-maclaurin.