Why We Get Fat -- with Gary Taubes

Why do we get fat -- and what should we do about it? Conventional wisdom says eat less, move more. The problem is that this advice rarely works very well. Science writer Gary Taubes has spent the last decade finding a better answer. His book Good Calories Bad Calories has been very influential, changing the minds of many. Here Taubes discusses his controversial theories as well as the criticism of them. Why do we get fat?