Marathon nutrition coach
A practical, evidence-based guide to fueling marathon training and race day.
Written by Victura Nutrition TeamReviewed by Victura Editorial ReviewLast updated Oct 19, 2026
Quick answer
Most runners do best with 30-60 g carbohydrate per hour early in the race, then more only if they have practiced it. Use portable options such as a 32 g gel (1 packet; about 1 oz) with 240 g water (8 fl oz), 40 g raisins (1/4 cup), 50 g dates (2 Medjool dates), or 120 g banana (1 medium).
A practical, evidence-based guide to fueling marathon training and race day.
Key takeaways
- Practice race-day foods, fluids, and timing during long runs, not on race morning.
- Aim for 30-60 g carbs per hour in long runs, then build toward 60-90 g/h only if tolerated.
- Use familiar whole foods and sports products; portions are listed in grams with household units for accurate practice.
- Individual fluid and sodium needs vary widely; treat 400-800 mL fluid per hour as a starting range to adjust for sweat rate, heat, and tolerance, and consider sodium for long or hot efforts.
- A coach can individualize portions, gut training, and race logistics; costs and services vary, so confirm what is included before buying.
Evidence-based marathon fueling plan
Research-backedBuild the weekly plate
Marathon fueling is not only race-day math. A coach starts with a repeatable training plate: carbohydrate at most meals, moderate protein, and enough total energy to support mileage.
For a 70 kg runner, a common starting range is 5-7 g carbohydrate per kg per day on easy days and 7-10 g/kg on high-load days; adjust with a qualified professional. Pair carbs with 20-30 g protein per meal to support repair and satiety. Use the plate to protect training quality, not to chase a perfect macro split.
See Victura's guide to carbohydrate loading and protein for endurance athletes for more detail.
The fueling timeline
Use the table below as a practice template, not a prescription. Timing and portions must be rehearsed in training and adjusted for body size, pace, weather, and stomach comfort.
| When | What to eat | Portion (g + US units) | Why |
|---|---|---|---|
| 3-4 h before long run or race | Oats, banana, honey | 60 g dry oats (2/3 cup) + 120 g banana (1 medium) + 21 g honey (1 tbsp) | Familiar carbs with low fiber and fat |
| 1-2 h before | White bread with jam | 60 g bread (2 slices) + 20 g jam (1 tbsp) | Quick carbohydrate, low residue |
| 30-60 min before | Banana | 120 g (1 medium) | Easy carbs if tolerated |
| Every 30-45 min during long run | Gel with water | 32 g gel (1 packet; about 1 oz) + 240 g water (8 fl oz) | Portable carbohydrate and fluid |
| Every 45-60 min during long run | Dates or raisins | 50 g dates (2 Medjool dates) or 40 g raisins (1/4 cup) | Chewable carbs for variety |
| After long run | Greek yogurt, berries, oats | 170 g Greek yogurt (3/4 cup) + 140 g berries (1 cup) + 30 g oats (1/3 cup dry) | Protein plus carbs for recovery |
Carbohydrate targets and gut training
Most long runs are well supported by 30-60 g carbohydrate per hour. For marathon race efforts lasting longer than about 2.5-3 hours, some runners practice 60-90 g/h using multiple carbohydrate sources; this is a ceiling to train toward, not a race-morning experiment. Split intake into small doses every 20-30 minutes.
A 30 g gel every 40 minutes provides about 45 g/h, while a 32 g gel plus 240 g (8 fl oz) sports drink can push higher. Gut comfort improves with repeated practice over weeks.
Key takeaway: Practice every food, gel, and fluid in training before using it on race day.

Hydration and electrolytes
Start long runs with 400-800 mL (14-27 fl oz) fluid per hour and adjust for sweat rate, heat, and individual tolerance. Sodium needs vary widely; a salty sweater may benefit from an electrolyte drink or 300-600 mg sodium per hour, but check product labels and medical advice if you have hypertension or kidney concerns. Water alone is fine for shorter, cooler runs.
For long or hot efforts, pair fluids with carbohydrate and sodium rather than drinking large volumes without electrolytes.
Recovery and the whole-food short list
After long runs, aim for a meal with carbohydrate and 20-40 g protein within a few hours, plus fluids and sodium. Chocolate milk, yogurt with fruit, or rice with chicken all work. Keep a short list of foods you tolerate:
- Oats: 60 g (2/3 cup dry)
- Banana: 120 g (1 medium)
- White rice: 200 g cooked (1 cup)
- Potato: 200 g (1 medium)
- Greek yogurt: 170 g (3/4 cup)
- Raisins: 40 g (1/4 cup)
- Pretzels: 30 g (1 oz)
- Dates: 50 g (2 Medjool dates)
- Orange: 140 g (1 medium)
- Chicken breast: 100 g (3.5 oz)
Use these as building blocks, not a rigid menu. See hydration for runners and race-day fueling for more planning.
When a coach helps
A marathon nutrition coach is most useful when general advice is not enough. Look for a registered dietitian or sports dietitian with endurance experience, a written intake and tolerance history, and a plan you can test in training. Good coaches explain trade-offs, ask about GI symptoms and food access, and adjust portions rather than selling a single product.
Costs vary; ask what is included before buying. A coach should not diagnose or treat medical conditions outside their scope. Track practice fueling in Victura to make adjustments visible.
Real-world fueling habits and coaching fixes
Community insightCommon fueling mistakes
Runners often under-fuel early because nerves suppress appetite. They may also copy an elite athlete's carbohydrate target without building gut tolerance. Another common issue is trying a new gel, chewy, or drink on race morning; in practice, a coach usually slows the plan down by starting with familiar foods, setting timers, and recording what worked.
What runners ask a coach to fix
Typical requests include stomach upset, fatigue late in long runs, flavor fatigue, and confusing product labels. A coach may simplify choices to a few tested options: a gel, a chewy, a banana, and a sports drink. They also help plan around early starts, travel, and aid stations so the goal stays a repeatable routine, not a perfect spreadsheet.
A simple rehearsal routine
Use one long run each week to test race-day timing. Eat the same breakfast, carry the same products, and note portions, weather, and stomach comfort. Then adjust one variable at a time. A written log makes the next long run easier to plan and gives a coach useful information.
References
- Nutrition and Athletic Performance: position of the Academy of Nutrition and Dietetics, Dietitians of Canada, and the American College of Sports Medicine(pubmed)
- A step towards personalized sports nutrition: carbohydrate intake during exercise(pubmed)
- Carbohydrates for training and competition(pubmed)
- FoodData Central(usda)
Frequently asked questions
People also ask
What should I eat during a marathon?
Most runners do best with 30-60 g carbohydrate per hour early in the race, then more only if they have practiced it. Use portable options such as a 32 g gel (1 packet; about 1 oz) with 240 g water (8 fl oz), 40 g raisins (1/4 cup), 50 g dates (2 Medjool dates), or 120 g banana (1 medium). Avoid high-fiber, high-fat, and unfamiliar foods, and set a timer to take small doses every 20-30 minutes with fluids; stop or adjust if you feel gastrointestinal distress.
How many carbs per hour should a marathon runner take?
Long training runs often use 30-60 g carbohydrate per hour. For race efforts longer than about 2.5-3 hours, trained runners may practice 60-90 g/h from multiple sources, but that range is not a starting point; a practical build is 30 g every 40 minutes, about 45 g/h, then increase only if tolerance is good. Spread intake across the hour, pair gels with water, and practice for several weeks before race day while keeping a log.
Do marathon runners need a nutrition coach?
Not every runner needs one. A coach can help if you have repeated stomach upset, late-race fatigue, food allergies, a busy schedule, or a goal that requires precise fueling; look for a registered dietitian or sports dietitian with endurance experience. A good coach takes a history, writes a practice plan, and adjusts based on your logs, while general guidelines are enough for many runners who rehearse race-day nutrition.
How much does a marathon nutrition coach cost?
Costs vary widely by credentials, location, package length, and whether support is one-off or ongoing. Ask for a written quote and a list of what is included: assessment, fueling plan, product review, check-ins, and revisions; some coaches sell a single race plan while others offer monthly support. Insurance coverage for performance nutrition is uncommon, so confirm fees upfront and compare value and fit before buying.
When should I start carb loading before a marathon?
Carbohydrate loading usually starts about 36-48 hours before a marathon, not the night before. A common approach is roughly 8-10 g carbohydrate per kg body weight per day, using low-fiber, familiar foods; for a 70 kg runner, that is about 560-700 g/day split across meals and snacks. Example foods include white rice 200 g cooked (1 cup), banana 120 g (1 medium), bread 60 g (2 slices), and juice 240 mL (8 fl oz), and the plan should be practiced before race week; runners with diabetes or kidney disease should seek individualized medical advice.
Is a sports dietitian worth it for marathon training?
A sports dietitian is worth it when you want individualized help that fits training, medical history, food preferences, and budget. They can translate research into portions, timing, and product choices, then adjust based on your logs; they are especially useful for runners with GI issues, disordered eating history, diabetes, or complex schedules. For simple cases, a well-tested general plan may be enough, so choose a clinician who listens and explains rather than one who sells a single product.
What is the best pre-race meal for a marathon?
A tried-and-true pre-race meal is low in fiber and fat and eaten 3-4 hours before the start. Example: 60 g dry oats (2/3 cup) with 120 g banana (1 medium) and 21 g honey (1 tbsp), plus 240 g water (8 fl oz); a simpler option is 60 g bread (2 slices) with 20 g jam (1 tbsp). If the start is very early, take 30-60 g carbohydrate 1-2 hours before, such as a banana 120 g (1 medium), and avoid new foods.
How many carbs should I eat the week of a marathon?
Carbohydrate loading usually begins about 36-48 hours before the race, not the night before. A common approach is roughly 8-10 g carbohydrate per kg body weight per day using low-fiber, familiar foods; for a 70 kg runner that is about 560-700 g/day split across meals and snacks. Practice these foods before race week, and runners with diabetes or kidney disease should seek individualized medical advice.
Should I drink water or a sports drink during a marathon?
It depends on duration, heat, and your sweat rate. Water is fine for shorter, cooler runs, but for long or hot efforts pair fluids with carbohydrate and sodium rather than drinking large volumes without electrolytes. A starting range is 400-800 mL (14-27 fl oz) fluid per hour, adjusted for sweat rate and tolerance; a salty sweater may benefit from 300-600 mg sodium per hour, checking product labels and medical advice if you have hypertension or kidney concerns.
How do I practice race-day fueling before the marathon?
Use one long run each week to rehearse race-day timing: eat the same breakfast, carry the same gels, chews, or whole foods, and note portions, weather, and stomach comfort. Adjust one variable at a time and keep a written log. Aim to build from 30-60 g carbohydrate per hour toward higher intakes only if tolerated, and never try a new product on race morning.
How we review this guide
- Written by
- Victura Nutrition Team
- Reviewed by
- Victura Editorial Review
- Reference sources
- 6
- Last updated
- Oct 19, 2026
Ready to track your meals with AI?
Victura scans your plate, logs macros automatically, and coaches you toward your goals — halal, keto, diabetic-friendly, and more.