Jun 10, 2026 · 10 min · 8 segments
The biggest nutritional challenge facing ultrarunners is not carbohydrates, supplements, hydration, or meal timing. It's eating enough. In this episode, CTS Coaching Director Cliff Pittman breaks…
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The ISSN identifies matching daily caloric demands as the foremost nutritional challenge facing ultra-marathon runners.
Not which macros to prioritize, and not what to eat around workouts, not which supplements to take.
On big training days, caloric requirements can double or even triple compared to an easy day.
A three-hour run creates a fundamentally different energy demand than a one-hour run, and most athletes chronically undereat on their hardest training days.
On training days over three hours, minimize your caloric deficit during the session itself.
We'll talk about gut training in a moment, but aim for approximately twenty grams of protein every three waking hours on big training days, and increase your meal portions on long run days.
Don't eat the same way you would on a rest day when you've just run for four or maybe five hours.
And if you still fall short on a big day, make it up on your next rest or recovery day.
The ISSN identifies matching daily caloric demands as the foremost nutritional challenge facing ultra-marathon runners.
Not which macros to prioritize, and not what to eat around workouts, not which supplements to take.
On big training days, caloric requirements can double or even triple compared to an easy day.
A three-hour run creates a fundamentally different energy demand than a one-hour run, and most athletes chronically undereat on their hardest training days.
On training days over three hours, minimize your caloric deficit during the session itself.
We'll talk about gut training in a moment, but aim for approximately twenty grams of protein every three waking hours on big training days, and increase your meal portions on long run days.
Don't eat the same way you would on a rest day when you've just run for four or maybe five hours.
And if you still fall short on a big day, make it up on your next rest or recovery day.
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