Right here:

So, you ate less and exercised more and lost weight. But now the pounds are piling back on. You’re hungrier than ever, and you can’t seem to resist food. Once again, it’s all your fault, right?

Wrong. Blame evolution, and the fact that for the vast majority of human history, famine was a bigger threat than flab. Even your seeming lack of will power is part of a complex biological system that drives humans who have lost weight to regain it, according to new brain-scan research by scientists at Columbia University Medical Center.

…

Dr. Leibel also says that people should understand that regaining lost weight “is not free will. It’s biologically determined and the species that didn’t have this are the ones you see in the Museum of Natural History.” It’s only been in recent decades that this mechanism is contributing more to obesity than survival.

Um, yeah.