meta_pixel
Tapesearch Logo
Log in
Sigma Nutrition Radio

#605: Fasting, Nutrient Timing & CGMs: Interpreting the Evidence – Prof. James Betts

Sigma Nutrition Radio

Danny Lennon

Health & Fitness, Nutrition

4.8 • 633 Ratings

🗓️ 12 May 2026

⏱️ 56 minutes

🔗️ Recording | iTunes | RSS

🧾️ Download transcript

Summary

Fasting, nutrient timing, chrono-nutrition, and continuous glucose monitoring are all topics that have generated substantial interest, but they are also areas where exaggerated claims can easily outpace the underlying evidence.

In many cases, tentative hypotheses are presented as if they were already well-established conclusions, despite the fact that the research base is often more mixed and context-dependent than popular narratives imply. It is one thing for an idea to appear biologically coherent. It is another for that idea to translate into meaningful, reliable effects in real-world interventions.

In this episode, Professor James Betts discusses how to think clearly about these topics, why common errors in interpretation can lead to overstated conclusions, and what is required to properly evaluate whether an observed effect reflects a true intervention effect rather than baseline differences, inappropriate comparisons, within-group changes, or mechanistic signals being mistaken for meaningful health outcomes.

Timestamps:

  • [04:24] Background into Prof. Betts' research
  • [07:28] Evidence in fasting research over past 5-6 years
  • [10:15] Hype vs evidence in intermittent fasting
  • [16:44] Spotting spin in study conclusions
  • [17:31] Common statistical red flags
  • [24:45] Methods matter in fasting trials
  • [31:10] Exercise nutrient timing
  • [38:32] CGMs what they measure, misuse and patterns
  • [53:59] Key ideas (premium-only)
  •  

Links:

Transcript

Click on a timestamp to play from that location

0:00.0

Hello and welcome to Sigma Nutrition Radio. This is episode 605 of the podcast. My name is Danny Lennon.

0:07.5

You are very welcome to the show. We're on quite the run of podcasts, if I say so myself,

0:13.2

and lots of great feedback over the last couple of weeks on some of our recent episodes. So if you've

0:18.5

missed any of those, I think it's worth adding them to your

0:21.2

to listen list. Last week, we had Dr. David Allison talking all about some of the aspects that are

0:26.7

really important to consider when interpreting nutrition studies for doing better nutrition

0:31.5

trials in the future and getting better quality answers. And in particular, picking up on some of the

0:36.3

important statistical concepts that

0:38.7

allow us to spot when a study is being misrepresented, or if the conclusions don't actually

0:44.6

match the data, or if a study is even set up to answer the question that it claims to do.

0:49.9

Lots of great feedback on that, so if you haven't listened, I think it's worth listening.

0:53.6

And for those who did listen into that episode, you will note that a few of those themes are going

0:58.1

to emerge today as well and will overlap with a couple of those ideas, which I think will really

1:03.0

help solidify those and see examples of where that plays out in other areas. So that will be

1:08.4

particularly useful. Previous to that, I had Dr. Andrew Reynolds on the show to talk

1:12.6

about his discussions around dietary fiber, whether it could be considered essential or not in the

1:18.5

future, this concept of essentiality of nutrients, how we define that, and then some of the evidence

1:23.6

we have to date on dietary fiber intakes and chronic disease risk. Lots of good

1:28.2

feedback on those couple episodes, so worth checking those out if you have yet to listen to those.

1:35.4

Today I'm going to be talking with Professor James Betts of the University of Bath, who was previously

1:40.6

on the show back in episode 399. There we talked about some of his really important

1:46.5

work that related to concepts like intermittent fasting and would there be any benefit to such

...

Transcript will be available on the free plan in 5 days. Upgrade to see the full transcript now.

Disclaimer: The podcast and artwork embedded on this page are from Danny Lennon, and are the property of its owner and not affiliated with or endorsed by Tapesearch.

Generated transcripts are the property of Danny Lennon and are distributed freely under the Fair Use doctrine. Transcripts generated by Tapesearch are not guaranteed to be accurate.

Copyright © Tapesearch 2026.