Glycemic index of food will be determined. In brief, overnight fasted subjects will be given the bread (50 g of carbohydrate) to ingest within 10-15 min and drink 250ml of water. Blood samples will be taken immediately before the meal and at 15, 30, 45, 60, 90 and 120 minutes after meal ingestion. Blood will be withdrawn by a trained practitioner and will be used for the determination of glucose.