I don't just make resolutions at New Year ... in fact almost never make them then. I do make them in September - and constantly reaffirm them throughout the year. Here are the ones I try to follow now ....
Drink lots of water (and no coffee during after I leave the house in the morning)
Take a healthy lunch to the office (to avoid having to go to the cafeteria at the office which has way too much temptation)
Go to the gym everyday and have a balanced program for cardio, strength and flexibility
No junk food (well - almost none and chocolate does not count)
No processed food (as little as possible - I do allow canned tomatoes or beans and try to buy organic)
Five or more servings of fruits and vegetables per day (usually raw)
Spend some time meditating/journalling every morning and night.
There items are pretty well habit now with some slip ups.
This website is a great source for healthy vegetarian (Vegan actually) recipes.