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Fueling the Long Run: Nutrition for Ultra Runners

B
BackMyRun ExpertAuthor
7/11/2026Published
Fueling the Long Run: Nutrition for Ultra Runners

Ultra running is not just a test of stamina but also a challenge of nutrition strategy. Proper fueling can make or break your performance on race day. In this guide, we'll explore the essential nutrition strategies to prepare you for long runs and ultra races.

Understanding Your Energy Needs

Ultra runners typically require more calories than standard marathon runners, as they are often on their feet for several hours. Understanding your caloric needs is crucial to maintain energy levels throughout the race. Generally, you can estimate your energy needs with the following formula:

  • Base calories: 10-15 calories per pound of body weight per day.
  • Add 100-150 calories for every hour of running.
  • During long races, aim for 200-300 calories per hour from a mix of carbohydrates, fats, and proteins.

Carbohydrates: Your Primary Fuel Source

Carbohydrates are the cornerstone of your fueling strategy. They are your body's preferred source of energy during long-distance running. Here's how to effectively incorporate carbs into your diet:

  • Focus on complex carbohydrates like whole grains, fruits, and vegetables in your daily diet.
  • During long runs, use quick-digesting carbs such as energy gels, chews, or sports drinks.
  • Aim to consume 30-60 grams of carbohydrates per hour during your run.

Hydration Strategies for Ultra Running

Staying properly hydrated is as crucial as fueling. Dehydration can lead to decreased performance and increased risk of injury. Here's how to maintain hydration:

  • Drink water regularly throughout your training, aiming for 16-24 ounces per hour.
  • During runs longer than an hour, incorporate electrolyte-rich beverages to replace lost salts.
  • Consider using hydration packs or belts for easy access during long runs.

Timing Your Nutrition

Timing is key when it comes to nutrition for ultra running. Here’s a practical timeline:

  • Pre-run: Have a carbohydrate-rich meal 3-4 hours before your run.
  • During run: Follow the 30-60 grams of carbs per hour rule.
  • Post-run: Within 30 minutes, consume a mix of carbohydrates and protein for recovery.

Experimenting with Fuels During Training

Every runner is different, and what works for one may not work for another. Use your training runs to experiment with different fueling strategies. Consider the following:

  • Try different brands and types of energy gels and chews to find what settles best in your stomach.
  • Experiment with solid foods like bananas, nut butter, or energy bars to see how your digestive system handles them on the run.
  • Adjust your hydration strategy based on weather conditions and personal preferences.

Common Nutrition Mistakes to Avoid

As you prepare for ultra events, be mindful of these common mistakes:

  • Neglecting to practice your nutrition strategy during training.
  • Overeating or undereating before the race, leading to energy crashes.
  • Ignoring hydration needs, especially in warm weather.

Key Takeaways

Fueling for ultra running requires a balance of carbohydrates, hydration, and timing. Practice your nutrition strategy during training to find what works best for you. Remember, proper fueling can enhance your performance and make your ultra running experience enjoyable.

Fuel TypeCalories per ServingCarbohydrates (g)Electrolytes (mg)
Energy Gel100220
Electrolyte Drink5012200
Energy Chews90220
Banana105270
Nut Butter Pack20060

Frequently Asked Questions

Aim for 200-300 calories per hour, adjusting based on your individual energy needs.
Quick-digesting carbohydrates like energy gels, chews, bananas, and electrolyte drinks are great options.
A combination of both is ideal. Water hydrates, while electrolyte drinks replenish lost minerals.
Practice your fueling strategy during training, and avoid trying new foods on race day.
Start consuming fuel 30-45 minutes into your run and continue every 30-60 minutes.
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