I'm in a similar place to Gary. I don't believe in resolutions. I don't believe in "promising to be good" which often ends with "relapsing to being bad". Extremes don't work. I believe in finding the middle ground that you can live with.
So I too want to keep doing what I've been doing: I want to keep my blood sugar as stable as possible, with knowing that as a Type 1 it will sometimes go wonky on me and I'll have to tweak doses. Non-D related I have an arrhythmia that is currently stable but will get worse. I'm hoping to keep it from doing that at least until I have Medicare (12/13) and thus free hospitalization - hopefully longer.
The bane of my existence is always weight gain. Despite 18 years of recovery from my eating disorder, for which I am truly grateful, D makes it hard. I gain weight by looking at carbs. I achieved a small gradual weight loss by being pretty strict with carbs. Just a little bit of increase, a long way from abuse and I start gaining weight again. Hopefully I can maintain and continue to lose or at least stay stable.
I don't believe in resolutions because I don't believe in swinging from extreme deprivation (or what feels like it) to indulgence. I believe in finding a happy middle I can be...well...happy with. That works.
My health goals for 2013 are that happy medium.