The main reason I strive for tight control is that I physically feel better on a day to day basis if my blood sugar is between 100 and 150. I also believe though, that doing so not only makes me feel better day to day, but it will delay the cardio-vascular complications common to my family. This article confirms this.
Diabetes Study Verifies Lifesaving Tactic – New York Times
But the result also gives rise to questions: Does the same effect occur in people with Type 2 diabetes, which usually occurs later in life and involves an inability to respond to insulin? And why would tight control of blood sugar for one brief period have such a pronounced effect later?