In this episode, Harvard professor and obesity researcher Dr. David Ludwig joins the show to discuss his new paper "Overcoming Impasse in Nutrition Science," published today in Cell Metabolism (https://doi.org/10.1016/j.cmet.2026.01.013). Dr. Ludwig—author of the New York Times bestseller Always Hungry and one of the leading proponents of the carbohydrate-insulin model of obesity—uses the framework of science philosopher Thomas Kuhn to explain why paradigm clash in nutrition has stagnated into paralysis. We walk through the carbohydrate-insulin model versus the energy balance model, then dig into two highly cited clinical trials at the center of this debate: his group's 2018 BMJ feeding study and the 2021 Nature Medicine crossover trial—and why, despite publicly available data, the field has failed to resolve the competing claims from either study.
We then turn to what a path forward looks like: why ad hominem attacks poison the trust needed for collaboration, how professional societies and funders could incentivize adversarial collaboration between opposing researchers, and what a definitive long-term feeding study would need to look like to settle these foundational questions. Whether you follow the carbohydrate-insulin debate closely or just want to understand why nutrition experts can't seem to agree, this conversation is a candid call for humility, rigor, and scientific renewal.
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