Functional Insulin Treatment (FIT) is the most effective method of treatment for type 1 (insulin-dependent) diabetes available today. Whether with an insulin pump or with multiple daily injections, the diabetic patient trained in FIT is able to dose his insulin on the basis of actual function so that he achieves near-normoglycemia and the freedom to eat when, what and how much he wants. The goal of FIT is to adapt the therapy to the lifestyle of the patient. This book creates a common basis for communication among therapists (physicians, nurses, dietitians, diabetes educators) and patients involved in FIT. It clearly defines the principles of the treatment and describes the contents, media and techniques of a practical program for training patients to carry it out.