It's not a sugar-addiction, but my love for sweets doesn't help. It's a purposeful re-wiring of the brain by the food industry. Some people are more susceptible to it than others. I'm one of the more susceptible people. D is not. Lucky him.
Anyway, I learned all this in David Kessler's fascinating, enlightening and at times disheartening book: The End of Overeating.
There is hope. Kessler doesn't provide a diet plan (thank goodness), but does strongly suggest establishing structure around food, eating and environment. He also suggests establishing firm rules.
And in reading his suggestions, I realized that is what I've allowed to almost completely slip away from my eating - firm rules and structure. No wonder it's been a struggle.