In this episode, I sit down with Dr Kevin Hall, a leading researcher at the NIH whose work has shaped how we understand energy balance, ultra-processed foods, and the drivers of obesity. With the release of the new U.S. Dietary Guidelines, we unpack what’s changed, what hasn’t, and where the science is still evolving.
This conversation goes beyond headlines. We explore what ultra-processed foods actually are, why they may lead to increased calorie intake, and what controlled feeding studies reveal about how our food environment interacts with human biology. From energy density to food texture and hyper-palatability, this is a deep dive into the mechanisms that may be driving overeating and weight gain in modern food systems.
What We Cover
- What stood out in the new U.S. Dietary Guidelines and how they differ from previous versions
- Why “ultra-processed foods” remain difficult to define and regulate
- The surprising results from controlled trials comparing ultra-processed and minimally processed diets
- Why people can eat hundreds more calories without feeling more satisfied
- The role of energy density, food texture, and hyper-palatable combinations
- Whether ultra-processed foods can be re-engineered to support better health outcomes
- How the modern food environment may be interacting with our biology to drive obesity
- Why individual responses to the same diet can vary so widely
This is a nuanced, evidence-based conversation that challenges simple narratives around food and health, and highlights where more research is urgently needed.
You can learn more about Dr Kevin Hall’s work at his website, follow him on X, or connect on LinkedIn. His book, Food Intelligence: The Science of How Food Both Nourishes and Harms Us, co-authored with Julia Belluz, explores the science of metabolism and ultra-processed foods.
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More about Kevin Hall
Kevin Hall, Ph.D. is an internationally recognized expert in human nutrition, metabolism, obesity, and neuroscience. For more than two decades, Dr Hall was the Integrative Physiology Section Chief at the National Institutes of Health where he made groundbreaking discoveries about how our environment shapes dietary behaviors, and how nutrition and physical activity affect human metabolism and body weight regulation. His transdisciplinary research has combined tightly controlled metabolic ward trials, advanced neuroimaging, and mathematical modeling to generate mechanistic insights into the drivers of obesity and diet-related chronic diseases. Dr Hall has published more than 150 scientific articles and is a sought-after public speaker, having delivered more than 250 presentations around the globe. Dr Hall has twice received the Director’s Award from the US National Institutes of Health and has also received the E.V. McCullum Award from the American Society for Nutrition, the Lilly Scientific Achievement Award from The Obesity Society, and the Guyton Award for Excellence in Integrative Physiology from the American Physiological Society. His work is regularly featured in major media outlets including The New York Times, The Washington Post, The Economist, CNN, BBC, and network television. Dr Hall has also been featured in several podcasts and documentaries about food, nutrition, metabolism, and obesity. He co-authored a book with health journalist Julia Belluz Food Intelligence: The science of how food both nourishes and harms us.
