You haven't been looking hard enough.
We had this big huge mammoth that used to work in our building. We were on the 2nd floor of a 2story building. He would walk by and literally shake the entire floor. I don't know how much he weighed but it had to be easily 500lbs. He would come to work in the morning with no less than 2 large sodas (64oz from the gas station), 4 hash browns, and 6 breakfast sandwiches from McDz. He would eat all of that in about 15 minutes and slurp on the soda for the next few hours. He would go to lunch and return from BK (or wherever he went that day) with 4 of their largest burger, 2 jumbo fries, and 2 large sodas from the gas station again. I once saw him power through 20 taco bell tacos in about 20 minutes. This dude may have had something wrong with him, but the fact is he ate too much fast food to be healthy in the first place.
I have never met a morbidly obese person that did not eat too much. I know a lot of people who have thyroid problems and they have trouble keeping weight off. I know diabetics who have trouble keeping weight off. I write posts where I regularly end sentences in prepositions. Key thing is the diabetics and thyroid cases I know that eat moderately are just sort of "chunky" where the people that don't control their diet go full on next-stage-of-human-evolution fat.
The way I see it is that we have an obesity epidemic in America that has become so overwhelming, so horrendous, that everyone and their mother is leaping at anything that could possibly be the cause of this epidemic. The fact is that it could be anyone of these things alone or a combination of the factors. Another common thread among the current generations of Americans is the lack of ownership. We as a people are fucking tremendously quick to shift blame. Nobody wants to take ownership of their problems. Its the government. Its my mom's fault. My mommy didn't love me enough and that's why I raped, killed, ate, and froze gay men (Dahmer). No! You don't have a job because you over-value yourself and won't accept a job that pays little but gives good raw experience to match your education. The government has nothing to do with you not having a job. You're fat because you eat too much and don't exercise enough. The fact your mom put you on formula when you were 6mos old was because her titties dried up and she didn't have any choice. That didn't make you fat. You eating fast food 2/3 meals per day and the only exercise you get is from your car to your desk is why you are fat. And the reason why Dahmer killed all them dudes was because he was twisted as fuck. His mother's treatment of him as a child was an excuse and he would have committed those atrocities regardless and he would have found a different excuse (bullied at school etc) had his mother loved him to his liking.
My gym plays these little commercials and they had the best fitness commercial I have ever heard/seen (usually corny, but this was great). They started playing it on 1/1/12 it goes: "HEY! You know that great 6-pack abs you've been wanting. Forget it! Those are about as realistic as asking NASA to borrow a space shuttle this weekend to take a cruise to Mars. But, in the meantime, here are some great ab workouts that hand help you towards your goal." Losing weight comes from hard work on the diet and in gym (or other physical activity). Genetic and environmental predispositions can only hold you back if you let them.
/rantoff