A method of diabetes management, comprising (a) providing a glucose meter in communication with a portable microprocessor-based unit; (b) transmitting blood glucose level data into the hand-held microprocessor-based unit from the blood glucose meter; (c) running a program of instructions on the portable microprocessor-based unit or the glucose meter or both; (d) inputting data based upon the blood glucose level data as input data for the program of instructions; and (e) providing a signal to inject insulin when the blood glucose level data indicates.