Losing weight should be simple: eat less, exercise more. But according to author and health journalist Julia Belluz, it's complicated. Listen as Belluz talks with EconTalk's Russ Roberts about her new book, Food Intelligence. Belluz argues that a calorie is pretty much a calorie whether it's carbs or fat. Keeping calories under control is often harder than it sounds. The message isn't blame; it's agency with compassion: understand your body's feedback loops, redesign the choices around you, and choose a sustainable way to enjoy food. At the end of the conversation, Belluz makes the case for government intervention of various kinds to help us make what she sees as better food choices; Roberts pushes back.