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That Triathlon Show

The Real Problem With FatMax (It's Not About Carbs vs Fat)

That Triathlon Show

Mikael Eriksson

Health, Swimming, Endurancesports, Run, Cycling, Health & Fitness, Fitness, Ironman, Swim, Bike, Sports, Running, Sportscience, Triathlon

4.9596 Ratings

🗓️ 4 June 2026

⏱️ 59 minutes

🧾️ Download transcript

Summary

If you are focusing on improving your FatMax in 2026, you’re likely wasting time and money. Not only is fat a more expensive substrate to burn than carbohydrate (you get less energy for the same amount of oxygen by oxidising fat), but the Fatmax number you see in your lab report is mostly noise and very little signal. In today’s episode of That Triathlon Show I’ll explain exactly why that is, but I’ll also give you a tool to evaluate any test or measure that you might (or might not) want to be tracking, from Time Trials to VO2max, HRV and various biomarkers like ferritin and testosterone.

Transcript

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0:00.0

Welcome to that Traflon Show, the podcast presented by Scientific Traflon and hosted by me, Michael Erikson.

0:16.0

It's been a while since the last one, but it's just me today with the solo episodes.

0:20.0

I hope that my voice holds up

0:21.6

for around 40 minutes or so of continuous talking. But it is 6.30 in the morning and I already

0:27.8

have two big coffees in me. So energy-wise, I think I should be good. Before we get into it,

0:33.7

especially for newer listeners, please follow the podcast and subscribe to it wherever

0:37.9

you're listening. I publish new episodes every Thursday. It's a mix of interviews, co-hosted

0:42.4

episodes, and every once in a while a solo episode like this. But the Thursday timing is chosen

0:49.0

so that you can select whether you're listening to the podcast as your end-a-week work commutes or on your

0:55.4

weekend long ride or run. Also, please leave questions and feedback on the episode and other

1:01.2

episodes in the Spotify and YouTube comments. And remember that I put up a poll in Spotify for

1:05.4

every episode where you can rate how good it was. And I use this as feedback to improve the show.

1:10.4

So the more listeners engage with this and rate to improve the show. So the more listeners

1:11.4

engage with this and rate each episode in the poll, the more accurate and useful the feedback

1:16.4

that I'm getting. And yeah, that accuracy of feedback, accuracy of a measure is something that

1:21.7

we'll talk about in today's episode. So let's go on to that. We're going to talk about fat max today and why I think it's one of

1:29.5

the most overrated things that you can test and track as a triathlete. And yes, that applies even

1:35.8

if you're doing Iron Man, contrary to some popular belief, I would say. Now the title of this episode,

1:42.5

I selected to the real problem with fat max. It's not about

1:46.2

carbs versus fat. And that's a quite deliberately chosen title because we have a lot of very

1:51.8

smart people listening. And when you see a title about fat max and in a slightly negative

1:58.0

light, you immediately assume that you know where this is going,

...

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