This is an interesting discussion. Though it sounds wrong, I am going to have to side with monocle. When I see someone my first impression on them is their appearance. The first thing I start judging them on is that. Now when I see someone who is fat, then I will see what they eat at lunch.*
I never really noticed I did something like this until now. I just kinda did it subconsciously.
*note I meet most people in school so this is where it would apply