When I get my courage up to suffer some more, I'll fix my diet for good...eliminating high blood sugars. One would think it easy to eat right...but for me, this often proves elusive.
What worked for me was avoidance and major routine change.
I got rid of the "bad" food in my house and replaced it with only "good" food.
Then I changed my daily routine to include only eating good food.
It sucked for a little bit, but once it became routine it was pretty easy to maintain.
Then, once you start getting a return in the form of feeling a lot better, you'll have a great positive reason to keep doing it (as opposed to doing it to avoid a negative reason).
Once I got to that point, I never looked back.
Then it goes from a change in routine to a change in lifestyle. Once your lifestyle changes, it's harder to change back and easier to keep on it.