I have only been diabetic for three years, but from what I've encountered, the idea that Type 1 diabetics have to follow a strict diet in order to stay healthy seems like a myth. It is most likely that the idea comes from the fact that when people think "diabetes" they think Type II (since they account for 90+%), and yes Type II's have to follow a strict diet.
But I have remained on the same diet since being diagnosed at 20 years old, which includes pizza, hamburgers, ramen, pasta, soda, etc. (the typical college diet). From what I've found is that if you count carbs correctly and really fine tune your insulin pump, your bloodsugar stays in the non-diabetic range. My last A1C was 5.7 and I've never had one above 7.5 (except when I was first diagnosed, it was 15 =) ). I don't even try to limit carbs, if I drink a soda with 50 carbs, and take the appropriate amount of insulin, my CGMS barely shows a bump in bloodsugar level.
Of course, a poor diet is bad for anyone, but i'm only talking in terms of bloodsugar, not cholestoral etc.
Anyway, I wanted to get a feeling from other type 1's as to whether they follow a strict diet, or even a low-carb diet at all.