Too often we get caught up in all-or-nothing. If you want to make things healthier, mix them half and half! Can't stand the taste of whole wheat pasta? Mix it with half a serving of regular pasta! Want to cut the calories on your soda, don't like diet? Mix it half with diet! It's a great way to wean yourself off of unhealthy versions of things and get used to healthier ones!
Some great substitutions: Lowfat dressings for full flavor versions, neufchatel cheese for cream cheese, shredded zucchini for spaghetti. This helps you cut calories, without sacrificing the flavors you love, and lets you adapt gradually instead of abandoning your favorites!