1. A method for managing blood glucose levels associated with a diabetes care management treatment regimen, comprising: (a) electronically storing one or more optimal blood glucose values, one or more insulin dose values of a patient, one or more measured blood glucose values, and one or more scaling factors; (b) weighting an impact on a future blood glucose value based on said factors including customizing said weighting to an individual patient; (c) predicting an effect on the blood glucose of insulin dose actions performed by the individual patient based on the customized weighting; (d) calculating a further value that is based on said insulin dose values, said optimal blood glucose values, and said scaling factors; (e) displaying information according to said further value; and (f) delivering insulin in response to information associated with said further value.