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

Sigma Nutrition Radio

Release Date: 11/11/2025

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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.

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)

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