Dr. Mark Hyman debunks the myth that all calories are equal, explaining that food provides instructions that regulate health minute-by-minute via genes, hormones, and gut bacteria. He traces how flawed, weak studies demonizing fat led to disastrous health guidelines, though research now proves fat fuels metabolism, satisfies hunger, and enables weight loss. Hyman details how insulin-spiking carbs like sugar and wheat drive obesity, while high-fat diets effortlessly burn more calories, and how the 2015 Dietary Guidelines finally admitted this truth. Overall, he makes a strong case that food acts as powerful medicine, with the quality of calories, not just the quantity, determining prevention or causation of most chronic diseases.

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