Here is a great post on resolutions by one of my faves stumptuous.
The New Year is always the most popular time to make weight loss/fitness resolutions. However, its only the right time if its the right time for YOU and not just because you pigged out at Xmas.
Personally, I believe in small changes=big results! I challenge you to make small goals instead of massive ones. Decide to cook at home more often, or take up a sport or activity. How about drinking more water (thats mine!) or going to the gym with a friend! Pretty soon you won't be able to imagine life without it.
I feel a little preachy here, but since I've been dieting since my young teenage years, I know what has stuck with me and why. Believe me when I say, all or nothing is not the way to go! Whatever you do, make that one thing a priority and then move to the next thing when you have it down!