TrainingPeaks just launched a new set of data fields that promise to give insights into carbohydrate and fat use during exercise - even predicted amounts for planned sessions if enough data is provided.

So where did this come from? What is it telling us? How should I use this information? And is it unique, or are there other ways to achieve the same thing?

Studies/Websites mentioned:

TrainingPeaks Fueling Insights: https://www.trainingpeaks.com/coach-blog/introducing-fueling-insights/ 

Rothschild J et al. A Novel Method to Predict Carbohydrate and Energy Expenditure During Endurance Exercise Using Measures of Training Load. Sports Med. 2025; 55:753-774. https://doi.org/10.1007/s40279-024-02131-z 

Fueling Endurance eBook | T -12 Race Nutrition Course | Practitioner Resources

The Fueling Endurance eBook contains answers to 49 of the most common nutrition questions that runners, cyclists and triathletes ask, and contains insights, tips, and quotes from experts and athletes. 

The T -12 self-guided course will help prepare you for your next event, with online tools, guides, information and instructions to take you through the 12 weeks leading up to race day.

And the Fueling Endurance Practitioner Membership provides access to online tools and calculators I use all the time when working with endurance and ultraendurance athletes. This includes working out the carbohydrate needs for runners (road and trail) and cyclists for different types of training sessions.

For more into on each of these, check out fuelingendurance.com.

Fuelin:

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