Yes, there is good reason to try to make healthy choices when you are deciding what, and how much, you are going to eat. But sometimes, trying to make these choices starts to take on too much importance and creates a rigidity in your behavior and an imbalance in your life.
Most eating disorders start with a "diet" or an attempt to start to eat "healthy". Below is a link to a well respected and validated screening test which you can give yourself to take a look at your own attitudes about eating. Identifying eating problems early, before you become entrenched in these habits, can mean preventing your own eating disorder. If you think that your attitudes about eating and food have become rigid and create emotional discomfort, please ask for help now!
http://psychcentral.com/quizzes/eat.htm