My 14 year old son is using a Dexcom G5 and a t:slim pump. He is currently dosing a Bolus of Humalog of 1 unit for 4.0 carbs for breakfast, 1u/4.5 carbs for lunch, and 1u/4.2 carbs for dinner. He eats about 75 carbs breakfast, 60 carbs for lunch and about 90 carbs for dinner. We are going through so much insulin every day! And it seems like we may need to up the food bolus dosage to about 1u/3.75 soon. Could this be a pump site issue (i.e., poor absorption)? Insulin resistance? We were thinking of maybe changing to a steel cannula - would this help? Is this just a puberty thing? Is it normal to need so much insulin at this age, or should we be concerned?