Research on excess body weight and obesity has long been predicated on the fundamental assumption that weight is gained based on a 'calories in, calories out' equation. If you consume more calories than you expend, you gain weight, right?  Science reporter Gary Taubes and reader-turned-friend Nick Gulino are among a growing faction that says it might not be so simple. As Gulino himself has experienced, this conventional paradigm often leads to a culture of fat-shaming and blame for heavy individuals.