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Currently available closed-loop insulin delivery systems use algorithms that combine continuous glucose monitoring with automated insulin delivery. However, these systems require substantial input from patients to determine basal and bolus insulin dosing. Now, researchers present data on the iLet bionic pancreas, an automated system that requires patients to input only body weight and broadly estimated carbohydrate content of upcoming meals (i.e., “usual for me,” “more,” or “less”). A total of 326 people with type 1 diabetes (mean age, 28; range, 6–79) were randomized to the bionic-pancreas group or to a control group in which participants continued their usual insulin delivery method (i.e., multiple daily injections, pumps without automati…