There will probably always be some Type I, regardless, but since autoimmune problems are exacerbated by excessive insulin, I wouldn’t be surprised if there is a correlation between the Type I rate and sugar consumption. (Of course, I wouldn’t be surprised by the lack of a correlation, either.)
Perhaps part of the problem is that Type I used to be considered a juvenile disease, so pediatricians know to look for it, but people who develop it in adulthood can be overlooked. I didn’t know it was even possible to develop Type I in adulthood, until I watched a talk on YouTube by Dr. Troy Stapleton, a radiologist who developed Type I at age 40.