Effectiveness of the Carbohydrate Counting Method on Postprandial Glucose Concentrations After Consumption of Mixed Meals in Adults With Type 1 Diabetes

A total of 20 adults with type 1 diabetes on intensive insulin therapy consumed three mixed meals at noon between 1200 and 1300 hours, with and without the addition of 11 ml extra virgin oil, in random order. One week before entering the study, participants kept a detailed 7-day weighed food record with fingerprick blood glucose measurements pre-and-2hour post-meals for calculation of their carbohydrate (g) to insulin (units) ratio. Moreover, the individual correction factor was calculated. Thereafter, insulin requirements for the test meals were calculated based on the carbohydrate content of each dish and according to the personalised carbohydrate to insulin ratio. Postprandial glycemia was measured in capillary blood glucose samples at 30min intervals over 195min. For 24hr before each testing session, participants were asked to refrain from the consumption of alcohol and to maintain their usual physical activity pattern. On the day of testing, subjects were asked to consume their usual breakfast and abstain from food for at least 2 hours before their appointment. If blood glucose was >7.2 mmol/l at 1200, insulin was administered based on the individualised correction factor. If blood glucose was >10 mmol/l at the beginning of the testing session, insulin was administered to correct it and the subject was asked to return on another day. if hypoglycaemia occurred (defined as blood glucose level <3.8 mmol/l), the test session was stopped, the event was recorded and the patient treated appropriately. The on target 2hour postprandial blood glucose level was set between 3.9 and 10 mmol/l. Anthropometric measurements (body weight, waist and hip circumferences) were performed at every visit.