As the American people got fatter, so did marmosets, vervet monkeys and mice. The problem may be bigger than any of us.
Gammy Dodger stashed this in Things that shouldn't get eaten
The authorities tell us, ever more loudly, that we are fat — disgustingly, world-threateningly fat. We must take ourselves in hand and address our weakness. After all, it’s obvious who is to blame for this frightening global blanket of lipids: it’s us, choosing over and over again, billions of times a day, to eat too much and exercise too little. What else could it be? If you’re overweight, it must be because you are not saying no to sweets and fast food and fried potatoes. It’s because you take elevators and cars and golf carts where your forebears nobly strained their thighs and calves. How could you do this to yourself, and to society?
So we appear to have a public consensus that excess body weight (defined as a Body Mass Index of 25 or above) and obesity (BMI of 30 or above) are consequences of individual choice. It is undoubtedly true that societies are spending vast amounts of time and money on this idea. It is also true that the masters of the universe in business and government seem attracted to it, perhaps because stern self-discipline is how many of them attained their status. What we don’t know is whether the theory is actually correct.
Now you should read the full article - there is way too much good stuff to post here... http://www.aeonmagazine.com/being-human/david-berreby-obesity-era/