Fogg, a Fortune magazine "2008 new guru you should know," designed the online Behavior Wizard to help you pinpoint a habit you would like to stop, increase or decrease with a series of steps (Dot - one time, Span - specific duration of time, Path - now and forever) to achieve your goal by "removing the trigger, reducing the motivation and the availability."
See the "Eating Behavior Mapped into the Behavior Grid": http://www.behaviorgrid.org/ and check out the Behavior Wizard if you want to address a specific behavior like stop eating sugar or eat more greens, less meat: http://www.behaviorwizard.org/wp/
The US National Institute of Health (NIH) also offers a "guide to behavior change" for maintaining weight loss and notes "successful weight managers are those who select two or three goals at a time that are manageable."
Keep in mind "useful goals should be (1) specific; (2) attainable (doable); and (3) forgiving (less than perfect)."
RealAge.com is another resource to help you evaluate your nutritional health through a detailed survey that summarizes specific habits to modify to get you eating well and in a balanced fashion.
NIH's Aim for a Healthy Weight: http://www.nhlbi.nih.gov/health/public/heart/obesity/lose_wt/behavior.htm