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Sigma Nutrition Radio

#570: Fructose: Metabolism, Claims & Context for Risk – Scott Harding, PhD

Sigma Nutrition Radio

Danny Lennon

Health & Fitness, Nutrition

4.8 • 633 Ratings

🗓️ 22 July 2025

⏱️ 57 minutes

🔗️ Recording | iTunes | RSS

🧾️ Download transcript

Summary

Fructose has often been labeled a uniquely damaging nutrient, blamed for obesity, diabetes, and other metabolic diseases. But does fructose truly have unique harmful effects or are the risks associated with it related to context and quantity?

The episode explores how fructose is metabolized in the body, why it gained a reputation for being problematic, and what the scientific evidence says about fructose in our diets. You will gain insight into why fructose was singled out in the past (e.g., its unique pathway in the liver and lack of insulin response), and how newer studies put those concerns into context.

It covers important nuances for practitioners and health-conscious individuals, especially given public confusion and fear around fructose (even in fruit).

Guest Information

Dr. Scott Harding, Ph.D., is an Associate Professor of Nutritional Biochemistry in the Department of Biochemistry at Memorial University of Newfoundland. His research explores the complex interactions between diet, metabolism, and chronic disease, with a particular emphasis on the metabolic effects of dietary sugars (especially fructose), the role of fats and phytosterols in lipid metabolism, and how public health policies like sugar taxation influence population health outcomes.

Timestamps

  • [02:58] Dr. Harding's academic background
  • [08:45] Fructose metabolism in detail
  • [12:51] Fructose in diet and public health
  • [23:07] Current research
  • [29:53] Identifying biomarkers for fructose overconsumption
  • [31:12] Fructose impact on health
  • [40:58] The food matrix
  • [45:10] Personalized nutrition and future research directions
  • [54:06] Key ideas segment (premium-only)

Related Resources

Transcript

Click on a timestamp to play from that location

0:00.0

Hello and welcome to another episode of Sigma Nutrition Radio. My name is Danny Lennon,

0:05.1

and you are listening to Episode 570 of the podcast. You are very welcome. Today, I have the pleasure

0:12.2

of being joined by Dr. Scott Harding, who is an associate professor of nutritional biochemistry

0:17.3

at Memorial University at Newfoundland in Canada. And Dr. Harding's distinguished

0:23.1

research careers focused extensively on the complex interplay between diet, metabolism, and

0:28.5

chronic disease, particularly in recent times examining how dietary sugars, for example,

0:33.5

fructose, can impact metabolic health. His work has also investigated the roles of dietary fats,

0:40.1

phytosterols, and broader implications of public health initiatives, such as his work recently on

0:45.6

sugar taxation, as well as on other public health-related outcomes. And so he employs a variety of

0:52.7

different methodologies in his work from clinical trials to stable isotope tracing, animal models, and more.

0:59.1

With regards to today episode, we're going to focus in on that area of fructose, of which he has done some really interesting work in recent times.

1:06.5

And we're going to try and work through a number of different components related to concerns maybe about fructose.

1:12.7

First of all, by understanding some of its actual metabolism, what makes it unique, why we even

1:17.5

think about fructose differently to other types of nutrients, and then examine what do we know about

1:23.4

its potential effects, in what contexts, and then try and make this practically relevant

1:28.5

of in what situations may or may not fructose be a worry so we're going to hopefully try and

1:36.0

work our way through all of this also remember that there are a couple of previous episodes of

1:41.4

the podcast that also relate to the topic of fructose

1:44.3

that might be a nice adjunct to your listening that after this maybe you want to dive even

1:48.3

deeper or to go over some of these concepts there's a couple that i will mention in the

1:54.3

description box where you are currently listening that you can go and check out those previous

1:58.7

episodes related to fructose but for those those of you who are Sigma Nutrition Premium subscribers,

...

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