Closed-loop Control of Postprandial Glucose Levels After Meals With Different Macronutrients Content in Adults With Type 1 Diabetes

The patient's insulin pump will be used to regulate glucose levels.

Patient's usual fast-acting insulin analog will be used.

The Dexcom G4 Platinum glucose sensor will be used to measure glucose levels.

Interventions will be undertaken 1 to 5 days after sensor insertion. Subjects will be admitted at IRCM at 6:30 am in a fasting state. At 7:00, single-hormone closed-loop will be initiated. At 8:00, if glucose levels are between 3.5 and 12.5 mmol/L, the meal will be served. Patients will have 20 minutes to consume the meal. If glucose levels are not in this target range, the meal will be delayed for a maximum of 45 minutes. If after 45 minutes, glucoses levels are still not between 3.5 and 12.5 mmol/L, the test will be cancelled and rescheduled. The test meals will be: 1) 75g of CHO; 2) 75g of CHO + 35g of protein; 3) 75g of CHO + 35g of fat; or 4) 75g of CHO + 35g of protein + 35g of fat. The intervention day will end at 13:00.