Why? There will a bad day—or a sad-movie night. There will be a horrible date or a screaming boss or a children's birthday party that you must throw without spending $500 on fancy snacks for 5-year-olds. There will be a Thanksgiving dinner that requires fried onion bits for the casserole, or a visit from your mother-in-law that demands one pound of Almond Roca washed down with diet root beer.
Give yourself a pass on the emergencies and clean up your day-to-day snacking. Choose to shop only with a cart, as opposed to a smaller basket; the cart makes you more likely to choose "virtue" foods (fresh veggies, fruit, whole grains) over "vice" foods (candy, popcorn, soda). You can also stock your pantry with healthier versions of your favorite indulgences, like chips, dips and frozen premade dinners.
Keep Reading: 52 week-by-week resolutions for 2012