Marathon nutrition: complete strategy before and during the race
The marathon rewards regularity of intake and penalizes late improvisation. A clear strategy before and during the race stabilizes energy, hydration and digestion on the big day.
Article outline
In practice
Marathon: eight servings for a 4 h example
Assumption: 60 g/h already tolerated, giving 240 g over 4 h. Eight 30 g servings, every 30 min starting at 15 min, cover that calculation. Check carbohydrate in the official drink: subtract any you consume from servings to avoid double counting. Do not assume cup volume.
| Stage | Example calculation | Execution |
|---|---|---|
| 0:15 / 0:45 / 1:15 / 1:45 | 4 × 30 = 120 g | Spread servings; locate water stations |
| 2:15 / 2:45 / 3:15 / 3:45 | 4 × 30 = 120 g | Keep a tested product accessible |
| Delay or missed station | Recalculate remaining time | Do not take several servings at once to catch up |
Key takeaways
Point 1
Start taking it early enough to avoid energy debt.
Point 2
Synchronize nutrition and target pace throughout the race.
Point 3
Train the exact protocol on specific training sessions.
Point 4
Plan a digestive fallback plan without breaking the whole thing.
Simple glossary
Quick definitions for technical terms used in this article.
Sodium
An electrolyte; distinguish sodium mass from salt mass on labels.
1) Before the race: preparation and timing
The strategy begins the day before and the morning of the race: known meals, stable timing and pre-start protocol tested in training.
The first contribution to the race must be planned, not postponed until later.
2) During the race: regular flow and checkpoints
On a marathon, minor oversights add up quickly. A pattern of frequent intakes with temporal reminders is often more robust.
The water plan must take into account the available supplies and the weather of the day.
3) Digestive management and adjustments
If discomfort appears, temporarily simplifying concentration and maintaining a minimum intake often helps to stabilize the situation.
Avoid radical changes after a single signal; favor gradual adjustments over 20 to 30 minutes.
4) Practical race-day checklist
Check the complete logistics: number of sockets, order, water points, emergency option in case of heat or delay.
The final criterion is executability: you must be able to follow the plan even when tired.
FAQ
Should you wait until you are hungry to take a gel?
Better to follow a predefined timing. Waiting too long increases the risk of deficit.
How to adapt if the temperature rises?
Above all, adjust hydration and check sodium consistency without changing the entire plan.
Can I test a new product on the big day?
Not recommended. The marathon requires a routine already validated in training.
What is priority number one?
The regularity of the intakes throughout the race, more than the search for a perfect formula.
References
- ACSM/AND/DC - Nutrition and Athletic Performance (2016)
General sports nutrition position requiring individualisation; no calculator validation.
- Jeukendrup A. - Carbohydrate intake during exercise (2014)
Carbohydrate guidance by duration and intensity; serving examples are editorial calculations.
- Systematic review - Exercise-induced gastrointestinal syndrome (2017)
Review of exercise-related gastrointestinal disturbance; not a diagnosis from one symptom.
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