Trial 1) Carbohydrate only meal: Participants will consume a standardised carbohydrate meal (80 g of carbohydrates, 25 g protein, 0 g fat: meal composition, white rice, chicken, curry sauce; 420 kcal) and will self-administer (into the subcutaneous tissue of the abdomen, as per their regular routine) a rapid-acting insulin dose calculated as per the carbohydrate-counting ratio (e.g. 1 IU of insulin per 10 g of carbohydrates).