Coaching marathon
A practical, evidence-based fueling framework for marathon training and race day
Written by Victura Nutrition TeamReviewed by Victura Editorial ReviewLast updated Nov 11, 2026
Quick answer
Use familiar carbohydrate foods and drinks that you have tested on long runs. Examples include 30 g gel (1 packet) with 150-250 mL water (5-8 fl oz), 120 g banana (1 medium), 60 g dates (3-4 Medjool), or 240 mL sports drink (8 fl oz). Start early and take small, regular amounts rather than one large feed.
A practical, evidence-based fueling framework for marathon training and race day
Key takeaways
- Start race-day fuel 2-3 hours before with 100-150 g carbohydrate and familiar low-fiber foods.
- Target 30-60 g carbohydrate per hour early, up to 60-90 g per hour if trained.
- Drink 400-800 mL (13-27 fl oz) per hour and adjust for sweat, heat, and sodium losses.
- Practice every gel, drink, and breakfast in training before using it on race day.
Evidence-based marathon fueling
Research-backedWhat marathon nutrition coaching should cover
Coaching marathon is not a single meal or a magic gel; it is a repeatable system for matching carbohydrate, fluid, and electrolyte intake to training load and race-day logistics. A good plan protects glycogen stores, keeps blood glucose available late in the race, and reduces gut distress. It should also fit real life: work schedules, food preferences, budget, and the foods you can carry.
Use the sports nutrition hub for broader fueling basics and the carb loading guide for race week.
The evidence base is clear: endurance performance improves when athletes start exercise with adequate glycogen and take carbohydrate during prolonged efforts. Major position stands emphasize individualized carbohydrate targets, practiced in training, rather than last-minute race-day improvisation. For a marathon, the practical window is usually 3-6 hours of running, so both pre-race fuel and in-race carbohydrate matter.
Pre-race fuel: build the tank without overload
The day before the race is not the time for a giant, unfamiliar feast. A moderate carbohydrate focus over 24-48 hours works for many runners, while a formal carb load of about 8-12 g/kg/day for 36-48 hours is common for longer endurance events. For a 70 kg runner, that is roughly 560-840 g carbohydrate per day, spread across meals and snacks.
That is a lot of food, so choose low-fiber, low-fat options you already tolerate.
A race-day breakfast 2-3 hours before the start should deliver 100-150 g carbohydrate with modest protein and very little fat or fiber. Example: 60 g dry oats (2/3 cup) cooked with water, 120 g banana (1 medium), and 20 g honey (1 tbsp). Another option is 60 g bread (2 slices) with 30 g jam (1.5 tbsp) and 170 g low-fat Greek yogurt (3/4 cup).
If you cannot eat that early, a liquid carbohydrate drink can help, but practice it first.
During the race: carbohydrate, fluid, and sodium
Most marathoners should aim for 30-60 g carbohydrate per hour early on, moving toward 60-90 g per hour in longer efforts if the gut is trained and multiple carbohydrate sources are used. Start fueling in the first 30-45 minutes rather than waiting for fatigue. Gels, chews, bananas, dates, and sports drinks can all work; the best choice is the one you have rehearsed on long runs.
For a sub-4-hour marathon, the same framework applies; the shorter time window means fewer total grams, not a different plan.
Hydration should be individualized. A common starting range is 400-800 mL per hour (13-27 fl oz), adjusted for heat, sweat rate, and body size. Drinking to thirst is a reasonable guardrail, but very heavy sweaters may need more.
Avoid forcing large volumes of plain water, because excessive fluid without sodium can dilute blood sodium. Sodium needs vary; 300-600 mg per hour is a practical range for many salty sweaters, especially in heat. Test this in training with hydration and electrolytes.
Fueling timeline table
| When | What to eat | Portion (g + US units) | Why |
|---|---|---|---|
| 3-4 hours before | Oatmeal, banana, honey | 60 g dry oats (2/3 cup); 120 g banana (1 medium); 20 g honey (1 tbsp) | Provides sustained carbohydrate with low fiber and fat |
| 1-2 hours before | Toast with jam | 60 g bread (2 slices); 30 g jam (1.5 tbsp) | Tops off glycogen without a heavy stomach |
| 30-60 minutes before | Banana or sports drink | 120 g banana (1 medium); 240 mL sports drink (8 fl oz) | Quick carbohydrate and familiar fluid |
| Every 30-45 minutes during | Gel with water | 30 g gel (1 packet); 150-250 mL water (5-8 fl oz) | Delivers carbohydrate and supports absorption |
| Every 60-90 minutes during | Banana or dates | 120 g banana (1 medium); 60 g dates (3-4 Medjool) | Whole-food carbohydrate for variety and chewing |
| Immediately after | Milk and banana | 240 mL milk (1 cup); 120 g banana (1 medium) | Provides fluid, carbohydrate, and protein |
| 2-3 hours after | Rice, chicken, vegetables | 200 g cooked rice (1 cup); 100 g chicken (3.5 oz); 100 g vegetables (1 cup) | Rebuilds glycogen and supports recovery |
Whole foods to build a plan around
Choose foods you can eat at home and carry or find on course. Useful carbohydrate options include 120 g banana (1 medium), 200 g cooked white rice (1 cup), 60 g dry oats (2/3 cup), 200 g potato (1 medium), 60 g whole-grain bread (2 slices), 60 g dates (3-4 Medjool), 40 g raisins (1/4 cup), 140 g orange (1 medium), and 170 g low-fat Greek yogurt (3/4 cup). For protein after key sessions, use 100 g chicken (3.5 oz), 100 g eggs (2 large), or 170 g Greek yogurt (3/4 cup).
Keep race-week meals simple and low in fiber if you are prone to gut issues. White rice, pasta, white bread, bananas, and strained fruit or applesauce are common choices. Add salt to meals if you are a salty sweater and your clinician has not restricted sodium.
Do not introduce new fiber supplements, high-fat meals, or large salads the night before the race.
Recovery and coaching decisions
After long runs and the race, aim for 20-30 g protein plus 1.0-1.2 g/kg carbohydrate over the next few hours, with fluids and sodium. For a 70 kg runner, that is about 70-84 g carbohydrate in the first hour; example: 240 mL milk (1 cup), 120 g banana (1 medium), and 60 g bread (2 slices). Recovery nutrition supports adaptation and next-session quality, not just comfort.
A coach or sports dietitian can adjust targets for weight goals, GI conditions, diabetes, or pregnancy; this guide is education, not medical care.
Key takeaway: The best marathon fueling plan is practiced, portioned, and flexible enough to survive race-day nerves. Use Victura app to log long-run fuel and compare what worked.
Practical coaching insights from runners
Community insightWhat runners actually struggle with
In anonymized Victura meal logs and community check-ins, the same issues appear: runners nail the long-run breakfast but under-fuel during the run, or they copy an elite athlete's plan without testing it. The result is a late-race energy crash, nausea, or sloshing. The fix is boring and effective: write the plan, carry it, and log what happens.
Most problems are not exotic. They are missed alarms, gels that are hard to open with cold hands, aid stations that do not match the training plan, and breakfasts that are too large or too late. A useful coaching plan rehearses logistics, not just grams.
Habits that survive race week
- Practice two or three breakfast options and pick one for race day.
- Set phone alarms for fueling every 30-45 minutes.
- Carry a backup gel or chew in case an aid station is crowded.
- Check urine color and body weight trends during heavy training weeks.
- Rehearse cup handling, gel opening, and water chasing at aid stations.
Use the race-day fueling checklist to turn these habits into a one-page plan. Keep the plan visible in your kitchen and race bag.
A simple race-week rhythm
Monday through Wednesday, eat normal balanced meals with familiar carbohydrate, protein, and vegetables. Thursday through Saturday, lower fiber and fat slightly while keeping carbohydrate steady, especially if you are prone to gut issues. The night before, choose a simple meal you have eaten before, such as 200 g cooked rice (1 cup), 100 g chicken (3.5 oz), and cooked carrots.
On race morning, eat 2-3 hours before the start. If that is impractical, use a smaller liquid or low-fiber snack closer to the start and adjust based on training trials. Do not experiment with caffeine, high-dose sodium, or new supplements on race day.
When personalized coaching helps
A generic plan is a starting point. Personalized coaching helps when you have GI conditions, diabetes, food allergies, a history of exercise-associated hyponatremia, or repeated late-race bonking. A sports dietitian can estimate sweat rate, set sodium targets, and build a plan around foods you actually like.
A coaching package may include a race-week plan, aid-station strategy, and follow-up adjustments; pricing varies, so ask what is included before buying. The Victura app can help you log long-run fuel, fluids, and symptoms so adjustments are based on your own pattern.
This is education, not medical care. Seek clinical advice for persistent symptoms, eating disorder concerns, or medical conditions that affect fueling.
References
Frequently asked questions
People also ask
What should I eat during a marathon?
Use familiar carbohydrate foods and drinks that you have tested on long runs. Examples include 30 g gel (1 packet) with 150-250 mL water (5-8 fl oz), 120 g banana (1 medium), 60 g dates (3-4 Medjool), or 240 mL sports drink (8 fl oz). Start early and take small, regular amounts rather than one large feed.
How many carbohydrates per hour should I take during a marathon?
Many runners do well with 30-60 g carbohydrate per hour, while experienced runners in longer efforts may tolerate 60-90 g per hour using multiple carbohydrate sources. Start at the lower end if you are new to fueling, and increase only after practicing in training. Individual tolerance, intensity, and gut comfort matter more than a single number.
When should I start carb loading before a marathon?
A common approach is to increase carbohydrate to about 8-12 g/kg/day for 36-48 hours before the race, especially for longer endurance events. For a 70 kg runner, that is roughly 560-840 g per day. Keep fiber and fat moderate, and choose foods you already tolerate rather than a single huge pasta meal.
Do marathon runners need a nutrition coach?
Not every runner needs one, but coaching helps if you have GI issues, diabetes, food allergies, a history of hyponatremia, or repeated late-race crashes. A sports dietitian can set carbohydrate, fluid, and sodium targets and practice them with your schedule. A well-tested personal plan is more useful than copying another runner's plan.
How much water should I drink during a marathon?
A practical starting range is 400-800 mL per hour (13-27 fl oz), adjusted for heat, sweat rate, and body size. Drinking to thirst is a reasonable guardrail for many runners. Avoid forcing large volumes of plain water, because excessive fluid without sodium can be dangerous; use [hydration and electrolytes](/learn/hydration-electrolytes) to refine your plan.
What is the best race-day breakfast for a marathon?
The best breakfast is one you have eaten before long runs and can finish 2-3 hours before the start. Aim for 100-150 g carbohydrate with modest protein and low fat and fiber. Examples include 60 g dry oats (2/3 cup) with 120 g banana (1 medium) and 20 g honey (1 tbsp), or 60 g bread (2 slices) with 30 g jam (1.5 tbsp).
How many gels should I take during a marathon?
A gel every 30-45 minutes is a common starting point if each gel provides about 30 g carbohydrate, which works out to roughly 40-60 g per hour. Some runners use fewer gels plus sports drink, chews, or whole foods. Count total carbohydrate per hour, not gel packets alone, and practice the exact schedule in training.
How do I practice marathon fueling during training?
Use long runs as dress rehearsals. Test the race-day breakfast, the exact gel or chew brands, fluid volumes, and aid-station timing. Log what you ate, how many grams of carbohydrate you took per hour, and any gut symptoms. Adjust one variable at a time so you know what caused a good or bad outcome.
How many carbs should I eat the day before a marathon?
A common approach is 8-12 g/kg/day for 36-48 hours before the race. For a 70 kg runner, that is roughly 560-840 g carbohydrate per day, spread across low-fiber, low-fat meals and snacks you already tolerate rather than one large pasta dinner.
Should I drink plain water or sports drink during a marathon?
Both can work, but if you sweat heavily or race in heat, a sports drink or electrolyte source helps replace sodium. A practical starting range is 400-800 mL (13-27 fl oz) per hour, adjusted for sweat rate and body size. Avoid forcing large volumes of plain water, which can dilute blood sodium.
What should I eat after a marathon for recovery?
Aim for 20-30 g protein plus about 1.0-1.2 g/kg carbohydrate in the hours after the race, with fluids and sodium. For a 70 kg runner, that is roughly 70-84 g carbohydrate in the first hour, for example 240 mL milk (1 cup), 120 g banana (1 medium), and 60 g bread (2 slices).
How we review this guide
- Written by
- Victura Nutrition Team
- Reviewed by
- Victura Editorial Review
- Reference sources
- 7
- Last updated
- Nov 11, 2026
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