I'd like to hear an explanation from the personal responsibility crowd about this collective loss of willpower (don't have time right now to read the Guardian comments). I've heard some stats before about how we don't actually exercise less, or eat more than we did back then; it's about what we eat. And now we know, perhaps it's about when we eat.

We were just talking on the semi-low carb board about how we grew up, when we had parents with not-so-much money, eating a lot of carby things to stretch that dollar. And in my family, because my ever-thin dad had a big sweet tooth, we always had desserts. What we didn't do was eat many times a day or eat a lot of processed foods. On the very rare occasions when my parents would go out, TV dinners overseen by my older sister were an exotic treat.

And we're just starting to get a clue about epigenetics and obesity.