"Fat? No, I'm efficient!"
Though I agree in sentiment, there's still the case that if you don't eat more than X weight of food, you can't put on more than X amount of weight.
The ones who are happy being fat, fine. The ones who are trying to lose weight and can't because of their "hunger"... that's the problem. Because it's hardly ever a celery that they pig out on, but chocolate and other high-fat foods.
It's still down, in the end, to a question of willpower. If you want to slim, you'll allow yourself to feel a little more hungry and - at the same time - find ways to cure the hunger that don't involve fat.
Your gut is just as adaptable as any other part of you - it can learn, given time. And though I don't want to trivialise the effort of losing weight, especially if you have medical conditions or even just suffer from the inherent medical conditions of being overweight (such as it being more difficult on your joints to exercise), there's still a willpower game at play here.
I'm sure there are people who struggle 24 hours a day against hunger and lose. And I'm sure there are a hundred times as many who win for as long as they want to and then give up. And I'm sure there are a hundred times as many again who say they are trying, and don't even bother.
There are weight-loss TV programs where they "stalk" the contestants. They know they could be watched. They know they have cameras in their house. They know they have to cut down. But still they have midnight snacks and go shopping for high-calorie food (if it's not in the house, at least you have to expend more effort than normal to go get it if you have a craving!).
Not everyone is a lard-ass. But equally not every overweight person struggles against an unbeatable desire to eat only high-calorie food.
I've found antidepressants have negatively impacted my ability to keep my body where I want it to be, as odd as that sounds.
I'm taking an antidepressant for OCD problems, and since I've been taking it, I've had a significant reduction in trichotillomania (hair pulling) as well as other OCD problems and face numbness from extreme anxiety. However, I find that the antidepressant has neutered the highs as well as balancing the lows. I find I'm more complacent with things that bother me about myself, muting the motivation to correct them, and also killing most of the endorphin rush from exercising. Its a vicious cycle, because as you gain weight you get upset about your weight/wardrobe, and thus the original reason you were taking the antidepressant is replaced by your new unhappiness about your weight. I've tried to ween off the antidepressant but the OCD came back with a vengance as well as crippling levels of anxiety because I'm no longer used to it.
Its like being stuck between a rock and a hard place. Staying in shape was much easier without the antidepressant, but functioning and managing my OCD was much harder. I guess where I'm going from this anecdote is that the heavy use/overperscription of antidepressants may be causing others to get in this frustrating conundrum.