The significance of the sugar in the urine is the effect the diabetes is having on your kidneys, one of the first areas effected by it. They are searching for something that starts with a K, kytones or something.
Good job Spider, it's not easy to do and you seem to have taken it seriously. Taking the weight off is number 1, but keep watching what you eat and remember it's not just the sugar, it's the carbs over all.
Florida Bronco, don't be hard on your dad. I can guarantee you he didn't screw up with his diabetes to hurt anyone. It's not an easy thing to do. It's a whole lifestyle change and often from a lifestyle that was very much enjoyed. I'm sure your dad had his own regrets when it finally got beyond control.