Using Simplified Meal Boluses Versus Carbohydrate Counting in Adolescents With Hybrid Closed Loop Systems

This study is testing whether a simpler, fixed meal insulin dose works as well as the traditional method of counting carbohydrates for teenagers using a hybrid closed-loop insulin pump (sometimes called an artificial pancreas). **You may be eligible if...** - You are an adolescent with type 1 diabetes diagnosed at least 1 year ago - You are already using a commercial hybrid closed-loop insulin pump system - You are willing to follow study instructions and not start new glucose-lowering medications during the study **You may NOT be eligible if...** - You have other major health conditions that would make the study unsafe - You are unwilling or unable to commit to all study procedures Talk to your doctor to see if this trial is right for you.