In America today, nearly 10% of the population has diabetes; more than two-thirds of us are overweight or obese; and one out of 10 kids are thought to have nonalcoholic fatty liver disease. The journalist Gary Taubes blames all of these afflictions on one culprit: sugar. In a new book, Taubes argues that sugar is the “principal cause of the chronic diseases most likely to kill us…in the 21 st century.” Taubes joins us to make the case against sugar and why we’d be healthier without it.