I've learned just how important what goes into my body matters, and strive to eat a healthy diet - however - I have also learned that it is OK to enjoy a treat now and then.
Use the nutrition tracker - even on days that you go over. The nutrition tracker has helped keep me motivated, and helps with meal planning. Each night, I prepare my foods for work the next day and go ahead and enter them into the tracker. I can then plan a healthy dinner based on the totals.