#583: Ultra-Processed Foods & Fixing the Food Environment – Kevin Hall, PhD

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Introduction

Ultra-processed foods have become central to the way we eat and to many of the challenges we face in public health nutrition. They dominate supermarket shelves, shape population diets, and often appear as the prime suspect in rising obesity and metabolic disease rates. But beyond the label itself, what exactly makes these foods problematic? Is it their nutrient composition, their texture and palatability, the rate at which we consume them, or the broader environments that make them so accessible and appealing?

The debate around ultra-processed foods sits at the intersection of metabolic science, behaviour, and policy. It raises uncomfortable questions about how food systems evolved to prioritise convenience and profit, and what it might take to meaningfully change that trajectory.

In this episode, Dr. Kevin Hall joins the podcast to examine the evidence from controlled feeding studies and population research, exploring what we really know about ultra-processed foods, overeating, and how we might begin to fix the food environment.

Guest Information

Kevin Hall, PhD

Dr. Kevin Hall, PhD, is an internationally renowned expert in human nutrition, metabolism, obesity, and neuroscience. Dr. Hall has made groundbreaking discoveries about how our environment shapes dietary behaviors, and how nutrition and physical activity affect human metabolism and body weight regulation.

Having previously worked at the National Institutes for Health (NIH) for over two decades, Dr. Hall led transdisciplinary research that 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.

Timestamps

• [04:24] Dr. Hall’s background and career
• [06:47] Ultra processed foods and health
• [15:10] Mechanisms behind ultra processed foods
• [27:00] Healthy ultra processed foods: a possibility?
• [30:43] Minimizing ultra processed foods in different cultures
• [33:03] Policy and regulation for better food quality
• [44:26] The importance of pilot studies in policy implementation
• [49:10] Future of food and sustainable diets
• [51:50] Key ideas segment (Premium-only)

Related Resources

• Join the Sigma email newsletter for free
• Subscribe to Sigma Nutrition Premium
• Enroll in the next cohort of our Applied Nutrition Literacy course
• X:
  • @KevinH_PhD
  • @NutritionDanny
• Book: Food Intelligence: The Science of How Food Both Nourishes and Harms Us
• Previous episodes:
  • #429: Kevin Hall, PhD & Stephan Guyenet, PhD – Carbohydrate-Insulin Model vs. Energy Balance Model
  • #376: Kevin Hall, PhD – Plant-based Diet vs. Ketogenic Diet: Impact on Calorie Intake
  • #165: Kevin Hall, PhD – Testing the Carbohydrate-Insulin Model & a Response to Gary Taubes
  • #88: Kevin Hall, PhD – The Physiology of Fat Loss, Weight Regain & Carb or Fat Restriction?
• Studies:
  • Hall et al., 2021 – Effect of a plant-based, low-fat diet versus an animal-based, ketogenic diet on ad libitum energy intake
  • Hall et al., 2019 – Ultra-Processed Diets Cause Excess Calorie Intake and Weight Gain: An Inpatient Randomized Controlled Trial of Ad Libitum Food Intake

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