Diabetes may be a common chronic illness that imposes right smart demands on the individual tending system. Type 1 Diabetes Mellitus, Type 2 Diabetes Mellitus and Gestational Diabetes Mellitus are the types of diabetes. Type 1 Diabetes Mellitus outcomes from the auto-immune destruction of the insulin producing beta cells in the pancreas.Type 1 diabetes can be depicted from type 2 diabetes by auto-antibody testing and C-peptide test. Type 1 diabetes represents 10% of all diabetic cases. Type 2 Diabetes Mellitus is a a metabolic disorder that is characterized by insulin resistance and relative absence of insulin. Approximately 90% of patients suffer from type 2 diabetes. Sudden raise in the blood glucose levels due to placental hormones, during pregnancy leads Gestational Diabetes Mellitus. In addition to this, Type 3 Diabetes Mellitus is portrayed by the insulin resistance to brain which leads to Alzheimer’s disease.