Why has obesity skyrocketed despite our obsession with fitness and nutrition? Kara talks with former NIH researcher Kevin Hall about the surprising realities of human metabolism and the rise of ultra-processed foods. Discover why "The Biggest Loser" participants struggled to keep weight off, the truth about whether Americans actually need more protein, and how growing 15,000 calories of corn and soy per person per day is shaping our health. We also tackle the policy debate: Can we "Make America Healthy Again" through education alone, or do we need a tobacco-style overhaul of the food industry?
Hall is the author of "Food Intelligence," published by Avery Books.
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