The second group includes patients experiencing hyperglycemic episodes in the immediate post-operative period. These patients are discharged home on their preoperative Metformin dose and once daily insulin Glargine as decided by the discharging doctor (or based on half their last 24 hour requirements) and are advised to continue monitoring their fasting glucose levels at home. If fasting glucose levels of less than 4 or more than 10mmol/l are recorded at home, the patients are encouraged to contact the obesity clinic physicians for advice.