computing device generally includes a memory comprising one or more optimal blood glucose values one or more self care values of a patient one or more measured blood glucose values and one or more scaling factors for weighting the impact on a future blood glucose value and that are customizable to an individual patient to predict the effect on the blood glucose of self care actions performed by the individual patient a microprocessor in communication with the memory programmed to determine the one or more scaling factors from one or more physiological parameters including body mass metabolism rate fitness level or hepatic or peripheral insulin sensitivity or combinations thereof and calculate a further value the further value being based on the self care values and on the one or more optimal blood glucose values and on the one or more scaling factors and a display configured to display information according to the further value and a housing wherein the memory and the microprocessor are housed within the housing thereby providing a hand held readily transportable computing device the insulin delivery device may deliver insulin in response to information associated with the further value application_number US 92667507 A description the present invention is a system and method for simulating a disease control parameter and for predicting an effect of patient self care actions on the disease control parameter in the following detailed description numerous specific details are set forth in order to provide a thorough understanding of the present invention however it will be apparent to one of ordinary skill in the art that these specific details need not be used to practice the.