Forget trying to overhaul your diet. Lose the idea that you’re suddenly going to start training for your city’s marathon this year. And while you’re at it, ditch the promise to yourself that you’ll finally get out of debt, quit smoking, and drink less. How can a doctor like me actually be telling you this? Although those are all lofty and incredibly good goals to have (all of which top the list for most popular resolutions), the truth is that millions of Americans resolve to change their habits and behaviors overnight between December 31st of the old year and the first of the new year. And it doesn’t happen. Or it doesn’t stick for long. Barely a fraction of people succeed in the long haul.