My son is almost 14 and has been dx since he was 1yr old. He was experiencing typical puberty insulin resistance for about a year and regular basal/bolus changes were helping. Lately though, it has all gone out the window. He's at a 1:4 ratio for most of the day and his correction is now at 1:30. At his endo visit the other day the endo said we are seeing typical teenage insulin resistance. Together we have decided to add Metformin xr into his routine. She said that it will help with the resistance. I really hope so. She started with the XR to bypass the gastro trouble many have on the short acting form of it. Has anyone one else had to add this into the mix? Any results yet? I've always heard about how bad insulin resistance can be during puberty but WOW, I'm still shocked by how bad it is. The endo said that this will pass, he is just in the thick of it right now.