I love the phlaunt website (aka known as bloodsugar101, see the link in my sig).
When I finally admitted that I had finally slid from pre-D to type 2, I bustled about and bought some books, read and inwardly digested... The 101 website is a favourite, and I often recommend it. The site presents a range of studies, explains them, compares them, and draws conclusions on how the findings can affect us in the long run - and what steps to take to avoid diabetic complications.
My current goal (which shifts over time, and will shift again in the future) is to try not to eat foods that will raise my BG over 7 mmol/l at any time. This is the zone that I feel best with. I spent 2 months in that zone over the autumn, and would like to be there permanently.
I certainly didn't meet that goal over the Xmas period, but i didn't do badly. And as a result I didn't put on a single pound in weight, and I felt consistently well.
Plus the added belief that I am not steadily and progressively doing further damage to my beta cells.
I'm hoping it can be sustainable. Will have to wait and see.