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Sigma Nutrition Radio

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

Sigma Nutrition Radio

Danny Lennon

Nutrition, Health & Fitness

4.8 • 633 Ratings

🗓️ 11 November 2025

⏱️ 55 minutes

🔗️ Recording | iTunes | RSS

🧾️ Download transcript

Summary

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)

Links & Resources

Transcript

Click on a timestamp to play from that location

0:00.0

Hello and welcome to Sigma Nutrition Radio. My name is Danny Lennon. You are very welcome to the podcast.

0:06.3

This is episode 583. And today I'm going to be talking with Dr. Kevin Hall, who is an internationally

0:13.9

renowned expert in human nutrition, metabolism and obesity. And he's been at the forefront of

0:20.1

really important work over a long period of time

0:22.5

that relates to how our environment shapes certainly dietary behaviors, how things like

0:28.0

nutrition affect our metabolism and body weight regulation, and has really been at the forefront

0:32.9

of incredibly important work, some of which we'll be discussing today.

0:37.2

He previously worked at the

0:38.8

National Institutes of Health, or the NIH, for over two decades, where he led research that

0:44.5

combined tightly controlled metabolic ward trials, some advanced neuroimaging, some mathematical

0:50.5

modeling, and various other types of studies to really look at some of the drivers

0:55.6

of obesity and then therefore diet related chronic diseases.

1:00.5

He has recently published a book titled Food Intelligence, along with his co-author Julia

1:05.5

Bellewicz, which looks at a number of the things that happen when we consume food and takes

1:10.3

on some of the real

1:11.7

big talking points in nutrition and health right now.

1:16.1

In this particular discussion, we're going to focus in on one or two discussion points

1:20.3

that are really important both within academia as well as more broadly.

1:24.0

One of course relates to ultra processed foods and Dr. Hall having done several really important studies in this area has an informed position on this.

1:33.3

And so we're going to talk through where we currently are with that evidence and maybe some of the debates that are going on within academia at this particular point.

1:42.3

We'll also talk a bit about the food environment and how

1:45.7

that relates to things like food policy, which publicly Dr. Hall hasn't really been able to

...

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