The latest biological, sociological, and anthropological understandings of obesity all point to the idea that its far more complex than an unbalanced caloric intake. Here's the NYTimes take, reporting on a new study in JAMA: it's more about quality of food rather than quantity, and the increasing amounts of simple carbohydrates in our diets are changing the way our natural metabolisms function, in effect pushing up natural weight "set points." Take home message: don't necessarily eat less, just eat better (more veggies, less refined carbohydrates).