Type 1 diabetes (T1D) education focuses on managing blood glucose by estimating carbohydrate (CHO) meal content and dosing mealtime insulin based on an insulin to carbohydrate ratio. In general, one unit of rapid-acting insulin is administered per an individualized gram amount of carbohydrates in a meal. Although the primary macronutrient affecting postprandial glycemia is considered carbohydrates, other dietary factors including proteins and fats also have an impact. Several feeding studies have demonstrated high protein and fat meals delay the time to peak glucose and increase postprandial glucose levels. However, there is limited information about how high protein and fat meals influence postprandial glucose among adults with T1D in a free-living setting. This project fills the gap to identify how, in a free-living situation, high fat and high protein meals affect postprandial glycemia in people living with type 1 diabetics.