text: Because people can be very ignorant about certain things, and very closed- minded.  Being overweight can be caused by many things, but even unfortunately news stories you hear, all they talk about is people being overweight because of overeating- they don't mention those of us who are overweight because of other reasons. I am the same way myself- not overweight by choice, and no medical problems except being overweight, and exercise does nothing for my weight at all.  I eat no junk food and don't overeat at all but I just have a sluggish metabolism.