That's a very interesting post SaF. The link to seratonin and appetite could explain a lot.
The other thing I was going to say (sorry) is that there are two issues getting a bit mixed up here and to me they are very separate.
One is the pressure on women to conform to a very narrow idea of what is acceptable, the "ideal" figure is unattainable for most without surgery, women with heads too big for their bodies are admired and an enormous diet industry and food industry gets rich off the resulting headfuck that the average woman lives with regarding food, weight, clothes and all teh rest of it.
Separate to that is the fact that society as a whole men women and children are developing unhealthy attitudes to food, having sedentary lifestyles, cheap crap available everywhere and all teh rest of it, and the fact that being too fat is definitely bad for you as is being too thin. These things do need addressing and I think that Jamie gettign the turkey twizzlers out and taking on these big corporate schools in the US is a good thing, some of the things he has exposed have been shocking and I believe that he is sincere in wanting to help rather than just wanting publicity.
And that's the otehr thing - our lifestyles have become so much more sedentary in the last 30 years. It is not that people have got lazier than they were or eating more shit. Apparently average calories intake in 70s was higher than now. But the little bits of exercise that we have to do have gone. Most people now have access to a car, everything at work is computers so no getting up and walking to records, carrying heavy files around. Obviously manual work has decreased a lot. Escalators and lifts all over the place, no need to carry the shopping home from the shops any more. All these little bits of exercise that people just had to do as part of their life have gone and that I am convinced is at the heart of this.