06/07/2026
FRC | Study Breakdown / Evidence Review
What nutrition strategy was most associated with running under 3 hours in the Seville Marathon?
In this video, we break down a study of 160 marathon runners from the 2022 Seville Marathon examining fueling before, during, and after the race.
📄 Nutritional Intake and Timing of Marathon Runners: Influence of Athlete’s Characteristics and Fueling Practices on Finishing Time
Rubén Jiménez-Alfageme et al.
Published: 2025
PMCID: PMC11911277
Full study:
https://pmc.ncbi.nlm.nih.gov/articles/PMC11911277/
What the evidence showed:
• The only fueling variable significantly associated with running sub-3 hours was consuming the recommended 60–90 g of carbohydrates per hour during the race
• Fluid, sodium, caffeine, and pre-race intake were not significantly associated with finishing time
• Average carb intake across runners was only 35 ± 17 g/hour, well below recommendations
• Sodium and caffeine intake were also generally below current sports nutrition guidelines
What we focused on:
• Carb intake during the marathon
• Fluid and sodium intake
• Pre-, during-, and post-race fueling
• How fueling strategy may influence performance outcomes
Evidence → what the study found
Interpretation → how it applies to training
Fueling is trainable — and for many runners, it may be one of the biggest performance limiters in the marathon.
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