This article and the concept it discusses - that we have a "weight set point" - seems overly simplistic. Maybe I'm missing something, but weight isn't an indicator of obesity (or rather, it is a very poor one). Body fat percentage is a much better suited for this. Is the weight set point theory based on an overall weight or an amount of body fat?

Personally, I've been working out very regularly for some time but the change hasn't been in my weight, just in my body fat. Going purely on weight, "dieting" (eg: eating healthy and eating less) hasn't changed my weight at all. But I am orders of magnitude fitter and stronger than I was before. These articles only serve to highlight how little we know about how our bodies function.