Can Your Gut Microbiome Predict Your Training Response with Dr Matthew Cooke

Your gut isn’t just along for the ride… it could be influencing how well you train, recover and perform.

In this episode, Advanced Sports Dietitian Taryn Richardson is joined by integrative physiologist and researcher Dr Matthew Cooke to unpack the rapidly evolving science of the gut microbiome in endurance athletes. From how your training shapes your gut, to whether your microbiome could predict performance outcomes, this conversation bridges cutting-edge research with practical takeaways you can actually use.

If you’re an age-group triathlete chasing marginal gains, this is one area you don’t want to ignore.

What You’ll Learn in This Episode:

• How endurance training influences your gut microbiome composition
• Why higher training loads can be both beneficial and detrimental for gut health
• The link between gut diversity and aerobic capacity (VO2 max)
• How your microbiome may influence motivation, cognition and performance
• Whether your gut can predict how you’ll respond to training
• The truth about GI mapping tests and whether they’re worth your money
• When probiotics may help and when they’re a waste of cash
• Practical strategies to support your gut while fuelling for performance

Timestamps

00:00 – Introduction to the gut microbiome and why it matters for triathletes
02:20 – Meet Dr Matthew Cooke and his research background
05:00 – Microbiome vs microbiota explained simply
06:30 – Does training actually change your gut microbiome?
09:00 – Endurance vs strength athletes: what’s the difference in gut health
11:30 – The “U-shaped curve” of training load and gut health
13:00 – How quickly your microbiome can change
14:30 – The Boston Marathon study and performance-enhancing bacteria
17:00 – Is your gut linked to performance and VO2 max?
20:00 – Can your gut influence motivation and brain function?
22:00 – Fueling with gels vs gut health: what you need to know
24:30 – Can the microbiome predict training response?
29:00 – Military study: predicting who adapts… and who drops out
32:00 – Stress, sleep and diet: the hidden drivers of gut health
34:30 – Do you actually need a probiotic?
38:00 – Specific probiotic strains and performance benefits
40:00 – What is GI mapping and how does it work?
43:00 – Is microbiome testing worth it right now?
49:00 – Future of gut microbiome testing and personalised performance

Links & Resources

•  Read: Is AG1 Worth It? Sports Dietitian Review
•  Explore ways to work with Taryn: https://www.dietitianapproved.com
•  Connect with Dr Matthew Cooke: Matt.Cooke@latrobe.edu.au

Research Mentioned

Servetas, S. L., Hoffmann, D., Ravel, J., & Jackson, S. A. (2025). Evaluating the analytical performance of direct-to-consumer gut microbiome testing services. Communications Biology. https://doi.org/10.1038/s42003-025-09301-3

Cooke, M. B., Catchlove, S., & Tooley, K. L. (2022). Examining the influence of the human gut microbiota on cognition and stress: A systematic review of the literature. Nutrients, 14(21), 4623. https://doi.org/10.3390/nu14214623

Key Takeaway

Your gut microbiome is shaped by how you train, eat, sleep and recover. While the science is still evolving, one thing is clear: nailing the basics like fibre intake, diet diversity and managing training load will go a long way in supporting both gut health and performance.

Ready to Take Action?

If you want to dial in your nutrition and stop second-guessing your fuelling strategy:

• Grab the Triathlon Nutrition Checklist to see what you might be missing
• Or head to dietitianapproved.com to explore courses and programs designed specifically for triathletes

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The Triathlon Nutrition Academy® is a podcast by Dietitian Approved®. All rights reserved.