One of the things I usually do with clients early on in helping with weight loss is to explore their relationship with food - when do you eat? What do you eat? How do you eat? What is your mood or what are you feeling before and after you eat, and so on. I often get them to complete questionnaires as well.
The BBC website has some very useful information on our own individual make-up and eating habits and also a test that you can complete online. Have a look and see what you think. Check it out here BBC iWonder