Aim and Objectives: Type I Diabetes mellitus previously classified as juvenile diabetes is supposed to cause derangements in lipid metabolism, consequent on impaired glucose metabolism just like type II diabetes mellitus. If these patients are early diagnosed and properly treated, with good control of diabetes, degenerative changes may be postponed or stopped (or) onset may not occur. Aim is to Study lipoprotein patterns and disturbances in lipid metabolism in cases of type I diabetes mellitus, who are on regular treatment with Insulin.