My wife is diabetic. Here is what I have learned from her.
Like someone said if it is white dont bite. White food is high in starch and starch is converted directly to sugar. White bread, sugar, white flour, potatoes, pasta,,,,,,,,it is all either sugar or starch.
The best book we have found for explaining it all and setting up eating plans to deal with it is a book called The Zone Plan. It isnt a diet book, it is a book that deals with diabetes and how to plan your eating around it. My wife takes no pills and no insulin yet because she controls it with diet and exercise. The lard has to come off and the aerobic heart rate has to go up. Then you control your sugar by what you eat and dont eat, and especially by the timing of your eating. She eats 5 times a day, small doses. That way the pancreas doesnt have a fit with the insulin.
It is just getting used to it, and then it is back to quality life. I will get some recipes here that are glycemic safe. Gotta twist her arm a bit............