Translation:Why do you think that you are fat?
Is it meant to mean "why do you think you're fat?" (as in asking an insecure person about the reasons for their body image issues) or more like "why, in your opinion, are you fat?" (as in questioning someone's life style). I know how I would normally read a sentence like that in English, but how about Chinese? Or am I the only one who's having this problem.....
Probably it does roughly mean "feel", since it's asking a question which could be emotional. For example, you might think that you are fat if you measured your weight and height and your BMI is overweight, but you might feel that you are fat if you have poor self-esteem.