Half Marathon Nutrition Guide
Half Marathon Nutrition Guide
Practical race nutrition guidance for carbohydrate timing, in-race fueling and hydration practice, including before, during and after race advice.
Before The Race
- Eat a familiar carbohydrate-focused meal 2-4 hours before the race.
- Practice race breakfast before long runs.
- Avoid large amounts of fiber, fat or unfamiliar foods before racing.
During The Race
- Many runners benefit from carbohydrate during races lasting over 75-90 minutes.
- Practice gels, chews or sports drink before race day.
- Start fueling before you feel depleted.
After The Race
- Use carbs and protein soon after finishing.
- Replace fluids and sodium gradually.
- Eat a proper meal once your stomach settles.
Hydration
- Plan fluids based on weather, sweat rate and aid stations.
- Use electrolytes in warm conditions or if you are a salty sweater.
- Practice drinking while running before race day.
Common Mistakes
- Waiting until late in the race to take fuel.
- Relying on an untested gel or drink.
- Overeating the night before and feeling heavy.
Race-Day Timing
- 2-4 hours before: eat a practiced carbohydrate-focused breakfast or meal.
- 15-30 minutes before: optional small carb top-up or sports drink if practiced.
- During the race: many runners benefit from 30-60g carbohydrate per hour when racing longer than 75-90 minutes.
- After the race: use fluids, sodium, carbs and protein to support recovery.
Practice The Plan
- Practice the exact fuel timing during long runs or race-pace workouts.
- Increase carbohydrate intake gradually if your stomach is not used to fueling while running.
- Test gels, chews, sports drink and water together, because the combination affects gut comfort.
Practical fueling targets
These are practical ranges, not prescriptions. Adjust for body size, tolerance, weather, sweat rate and expected finish time.
| Situation | Target | Notes |
|---|---|---|
| Under 90 minutes | 0-30g carbohydrate total, or small top-up if practiced | Faster runners may rely mostly on pre-race fueling. |
| 90-150 minutes | 30-60g carbohydrate per hour | A gel every 30-40 minutes, chews or sports drink can work. |
| Warm or humid race | Fluid and sodium adjusted to sweat rate | Practice the plan during long runs, not on race day. |
Example Fueling Plans
- 2 hour half marathon: Take one gel around 35-40 minutes and another around 70-80 minutes, with water.
- 2:30 half marathon: Aim for 30-45g carbohydrate per hour from gels, chews or sports drink after practicing the timing.
Fluid And Electrolytes
- Use aid stations deliberately rather than grabbing fluid randomly.
- Pair gels with water unless the product says otherwise.
- Consider electrolytes in heat or if you lose visible salt on clothing.
Methodology
How this nutrition guidance is written
- Nutrition guidance focuses on practical race-day planning: familiar foods, carbohydrate timing, hydration and recovery.
- Fueling needs vary by body size, sweat rate, climate, tolerance and expected finish time, so the guide favors ranges and practice over one fixed prescription.
- The guides are educational sports-nutrition content, not medical nutrition therapy.
Sources reviewed
- Sports Dietitians Australia distance running factsheet - Reference for distance-running fueling, including carbohydrate guidance for half marathon and marathon racing.
- Sports Dietitians Australia eating and drinking during exercise factsheet - Reference for practical carbohydrate intake ranges during endurance exercise.
- IOC consensus statement on exercise in hot and cold environments - Reference for heat, hydration and carbohydrate considerations during longer exercise.
- Victorian Institute of Sport endurance fueling guidance - Reference for practical 30-60g carbohydrate-per-hour guidance in endurance events.
Last updated June 2, 2026 by the PaceConverter editorial team. Read the editorial policy.
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Frequently asked questions
What should I eat before a Half Marathon race?
Use familiar carbohydrate-focused foods before a Half Marathon race. The exact amount depends on race time, duration, tolerance and how close the meal is to the start.
Do I need fuel during a Half Marathon race?
Many runners benefit from carbohydrate during races lasting over 75-90 minutes.
Should I practice Half Marathon race nutrition?
Yes. Practice your nutrition and hydration approach before important races so race day feels familiar.