When your long runs stretch beyond 90 minutes, your body relies heavily on its glycogen stores for usable energy. Without a solid fueling strategy, you risk glycogen depletion and the dreaded “bonk.” This guide breaks down exactly how to fuel during a long run—covering energy gels, chews, sports drinks, and real food options so you can maintain energy levels and finish strong.
Quick Start: How to Fuel a 90–180 Minute Long Run
Need the short version? Here are the practical numbers to get you running.
Most runners doing long runs between 90 minutes and 3 hours should aim for 30–60 grams of carbohydrate per hour, split into small doses every 20–30 minutes. This approach keeps your active muscles supplied with their primary fuel source without overwhelming your stomach.
Example schedule for a 2-hour run:
- 30 minutes: One 25g energy gel
- 60–70 minutes: Second 25g gel
- 90 minutes: 4–5 chews (~20g) or half a medium banana (~12–13g)
Quick fuel reference:
- Energy gel: 20–30g carbs per packet
- 4–5 small chews: ~20g carbs
- Half medium banana: ~12–13g carbs
- Small handful raisins (30g): ~15–20g carbs
These guidelines apply to healthy adults—everyone’s body is different, and everyone’s body responds uniquely to various fueling strategies. Test your fueling strategy during training sessions, never on race day. Plan hydration alongside fuel, especially in warm conditions, using water plus electrolytes to support hydration and replace minerals lost through sweat. Maintaining the body’s fluid balance is crucial for both performance and recovery, and electrolyte intake after a long run helps restore this balance.
Why Fueling Matters on Long Runs
During prolonged activity, your muscles depend on stored glycogen and blood glucose as their primary energy source. Once you push past 60–90 minutes of sustained effort, those energy stores begin depleting faster than your body can replenish them naturally.
When glycogen levels drop critically low, runners experience what’s commonly called “hitting the wall”—sudden fatigue, heavy legs, reduced pace, and impaired concentration. This isn’t just discomfort; it’s your body signaling that it’s running low on fuel.
Research summarized by organizations like the American College of Sports Medicine confirms that carbohydrate intake during endurance sports helps preserve performance by maintaining blood glucose and sparing limited glycogen reserves. For shorter distances under 60 minutes, many runners can complete their workout without additional fuel. But for efforts lasting 90 minutes or longer, planned fueling becomes essential to maximize performance.
Beyond pace maintenance, proper fueling can lower perceived effort and help you maintain form through the final miles—reducing the risk of late-run breakdown when fatigue typically sets in.
How Much and How Often to Fuel During a Long Run
Sports nutrition research provides general guidelines, but finding what works for you requires practice. Here’s where to start:
Hourly carbohydrate targets:
- 30–45g per hour: Most recreational runners on 90–150 minute long runs
- Up to 60g per hour: Well-trained runners or race-pace efforts during marathon training or a half marathon prep
Breaking intake into smaller, frequent doses—10–20g every 20–30 minutes—proves easier on the stomach than consuming 40–60g at once.
Concrete examples:
- 90-minute run: Two 25g gels taken at 30 and 60 minutes (~50g total, ~33g/hour)
- 2-hour run: One 25g gel every 40 minutes (~37–50g/hour)
- 2-hour combination approach: 3 chews at 30 min (~15g), half banana at 60 min (~12g), 3 chews at 90 min (~15g)
Smaller runners or lower-intensity efforts typically thrive at the lower range. Larger endurance athletes or those running at marathon pace may benefit from higher intake. Track what works across multiple training runs to find your sweet spot.
Energy Gels: How, When, and For Whom
An energy gel is a concentrated carbohydrate packet designed for quick intake during endurance exercise. Most gels deliver 20–30g of easily digestible carbohydrates per sachet—typically glucose, maltodextrin, fructose, or blends—sometimes with added electrolytes like sodium.
Key advantages:
- Compact and easy to carry
- Consistent carb content for precise energy delivery
- Long shelf life for race day stockpiling
Timing recommendations:
- First gel around 30–45 minutes into runs lasting 90 minutes or longer
- Subsequent gels every 30–45 minutes to meet your hourly carb target
Energy gels work in different consistencies. Thicker gels usually require sips of water to dilute—your stomach tolerates roughly 6–8% carbohydrate solutions best. More fluid “aqua” style gels or an isotonic gel can be taken with minimal extra water.
Some gels contain caffeine (25–100mg) for an extra boost. Many runners benefit from the ergogenic effects, while others prefer caffeine-free options. Test your tolerance during training—never experiment with the sweet stuff on race day.
Practical tips:
- Practice opening gels at your planned pace
- Take gels with water rather than concentrated electrolyte drink to avoid stomach upset
- Find the right energy gel for your dietary preferences before your next race
Chews, Blocks, and Sports Drinks as Alternatives
Chews and blocks are bite-sized, gummy-style carbohydrate sources that many runners prefer over gels. Most chews provide 4–8g of carbs per piece, meaning 4–6 pieces deliver roughly the same carb load as one gel.
Why runners benefit from chews:
- Gradual intake (one piece every few minutes) for steadier energy
- Different texture and flavor profile—helpful when gel fatigue sets in
- Easy to share or split doses during training with partners
Sports drinks at 6–8% concentration deliver approximately 14–20g of carbs per 240ml serving alongside essential electrolytes. They’re useful for combining hydration with fueling, but watch the math—drink water with gels to avoid consuming too many gels worth of sugar from multiple sources.
Combined strategy example: Sip a carb-electrolyte drink throughout your run plus half-portions of chews every 20–30 minutes. This provides variety while meeting your energy needs.
Quick comparison: Gels offer precision and speed. Chews provide dosing flexibility and palatability. Sports drinks enhance body’s fluid balance while contributing carbs. Individual stomach responses vary—some runners find chews easier to digest than gels, while others experience stomach issues with solid textures. Test during training to discover your preference.
Real Food On the Run: Bananas, Potatoes, and More
Real food serves as a viable fueling option, particularly for slower paces, trail running, or ultra distances where carrying whole foods becomes practical. Many runners enjoy eating familiar ingredients rather than processed options.
Common real food options with carb content:
- Half medium banana: ~12–13g
- Small boiled baby potato with salt: ~10–15g
- Small handful raisins (30g): ~20–22g
- 4–5 dried apricots: ~15–20g
- Small rice ball: ~15–25g
- Sweet potatoes (small portion): ~15–20g
- Chia seeds mixed into homemade gels: varies
Selection principles:
- Choose low-fiber, low-fat, low-protein items to ease digestion
- Pick foods that stay palatable when warm and slightly squashed
- Some runners add maple syrup to homemade fuel for quick boost
Packaging ideas:
- Wrap salted potatoes in small snack bags
- Use reusable silicone pouches for mashed banana
- Pre-portion dried fruit with known carb counts
Real food offers taste variety and psychological satisfaction on very long efforts, using everyday ingredients you enjoy eating. The trade-offs: bulkier to carry, less precise dosing, and harder to eat at faster paces. For gluten free runners or those avoiding processed foods, real food strategies provide excellent alternatives—just test thoroughly during progressive long runs.
Easy to Carry Fueling Options
When you’re out on a long run, having easy-to-carry fueling options can make all the difference in maintaining energy levels and maximizing performance. For endurance athletes training for a half marathon or marathon, portability and convenience are key—especially when you need a quick boost without breaking your stride.
Energy gels are a top choice for many runners because they’re compact, lightweight, and deliver a concentrated dose of easily digestible carbohydrates. Whether you’re looking for a standard gel, an isotonic gel that’s gentle on the stomach, or a gel with added electrolytes or caffeine for an extra boost, there’s a product to match your nutritional needs and dietary preferences. The right energy gel can help delay glycogen depletion, support hydration, and keep your energy steady throughout your training sessions or on race day.
If you prefer real food during your long runs, there are plenty of portable options that provide complex carbohydrates and essential electrolytes. Bananas, dried apricots, and homemade energy balls made with maple syrup and chia seeds are all easy to carry and offer a blend of quick and sustained energy. Sweet potatoes and whole grains are also excellent choices for those who want to fuel properly with whole foods, while chia seeds add amino acids to support muscle recovery.
Other convenient fueling options include sports drinks and energy bars. Sports drinks not only provide carbohydrates but also help replace minerals lost through sweat, supporting the body’s fluid balance. Energy bars can be a good gluten free alternative for runners with specific dietary needs, but it’s important to choose bars that are easily digestible and won’t cause stomach upset.
To get the most out of your fueling strategy, aim to consume a gel, chew, or small portion of real food every 45 minutes to an hour during long runs. Always drink water or a sports drink alongside your fuel to stay hydrated and help your body absorb nutrients efficiently.
Remember, everyone’s body responds differently, so use your training runs to experiment with different gels, real food, and hydration strategies. By finding the fueling options that work best for you, you’ll be able to maintain energy levels, avoid stomach issues, and perform your best—whether you’re tackling a half marathon, marathon, or any long distance event.
Hydration and Electrolytes During Long Runs
Fluid and electrolyte balance interacts closely with your fueling strategy. Plan both together for optimal results.
Sweat rates vary widely—from 0.5 to 2 liters per hour—so no single volume recommendation fits everyone. Many runners do well sipping 8–20 ounces hourly, using thirst as a general guide while maintaining consistent intake.
Sodium is the primary electrolyte lost through sweat (300–2000mg per liter), with potassium and magnesium also present. Longer or hotter runs amplify these losses.
Common approaches:
- Plain water plus electrolyte tablets or powders
- Ready-made electrolyte drinks (with or without carbs)
- Alternating water and sports drink at race aid stations
Consider the combined sugar load from fuels and drinks—too much sweet stuff can cause GI distress. Some runners prefer to drink water with gels and save other gels or chews for separate intake.
Optional but useful: weigh yourself before and after long runs to understand personal fluid losses. Aim to replace most of what you lose without overdrinking.
Training Your Gut: Practice Makes Fueling Easier
“Gut training” involves regularly practicing carbohydrate intake during runs so your digestive system adapts to processing fuel while you’re in motion. Research shows endurance athletes can tolerate significantly higher carb intakes—up to 90g per hour—after repeated exposure compared to those who rarely fuel during training.
Building tolerance:
- Start at 20–30g per hour
- Increase by 10–15g per hour every 1–2 weeks
- Introduce only one new product at a time to isolate reactions
Reducing GI discomfort:
- Avoid high-fiber or high-fat meals 2–3 hours before long runs
- Take small, regular sips of water with gels or chews
- Slow briefly when eating if needed for complex carbohydrates or solid foods
Keep a simple fueling log noting what you eat, when, your pace, temperature, and any stomach feedback. This data helps refine your race day plan. Some trial and error is normal—patience pays off when dialing in your approach.
Tailoring Fueling to Distance, Pace, and Conditions
The “best” fueling plan depends on run duration, intensity, environment, and different preferences. Here’s how to adjust:
Half marathon training runs (90–150 minutes): Moderate hourly carb targets of 30–45g work well. Mix gels and chews based on preference. Focus on finding what settles best during intense efforts.
Marathon training long runs (2–3+ hours): More structured plans that closely match your race day strategy. Push toward 45–60g per hour on key sessions. Practice your exact pre-run breakfast, pre-start snack, and on-course timing.
Trail and ultra runs: Slower paces accommodate solid real food. Alternate sweet and savory items like potatoes or rice balls to prevent flavor fatigue. Amino acids from small protein additions may support muscle recovery on very long efforts.
Environmental factors:
- Hot and humid conditions increase fluid and electrolyte needs; opt for lighter flavors
- Cold conditions dull thirst; maintain consistent sipping even without feeling thirsty
Faster marathon pace makes chewing solid food harder—lean toward gels or fluids. Slower paces offer flexibility for real food. Rehearse your full race protocol during key long runs in the final 6–8 weeks before your event.
Sample Fueling Plans for Common Long Runs
These templates help you visualize timing and fuel types. Adjust for your nutritional needs, body size, and comfort.
Plan 1: 90-minute easy-moderate run (half marathon prep)
- 2 hours before: Toast with jam
- 30 minutes: 25g gel
- 60 minutes: 25g gel
- Sip water throughout
- Total: ~50g carbs (~33g/hour)
Plan 2: 2-hour run with race-pace segments (marathon buildup)
- 15 minutes before: Half banana for quick boost
- 30 minutes: 25g gel
- 70 minutes: 25g gel
- 100 minutes: 4–5 chews (~20g)
- Water plus electrolyte tablet
- Total: ~55g/hour
Plan 3: 3-hour trail run (early ultra training)
- 2.5 hours before: Small rice ball
- 45 minutes: Small salted potato (~15g)
- 90 minutes: Handful raisins (~20g)
- 135 minutes: Second potato (~15g)
- Sip sports drink throughout (~15–20g/hour from fluid)
- Total: ~45g/hour
These are starting points for experimentation. What works for one runner may require adjustment for another. Use training runs as your laboratory.
Safety, Individual Differences, and When to Seek Advice
Individual responses to fueling vary based on age, training history, genetics, and digestive sensitivity. This guide provides general informational guidance for healthy adults and isn’t a substitute for professional medical or nutrition advice.
Runners with specific conditions—diabetes, gastrointestinal disorders, or food allergies—should work with a qualified sports dietitian to customize their approach. If you experience persistent or severe symptoms during runs (extreme dizziness, chest discomfort, unusual shortness of breath), stop your workout and consult a healthcare professional.
Use credible sources when refining your strategy: sports nutrition research, registered dietitians, or official running organization guidelines. Sweat testing can reveal personalized sodium losses for those wanting precise data.
A well-practiced, personalized fueling plan transforms long distance runs from survival mode to sustainable, enjoyable training. Fuel properly, practice consistently, and your body will thank you on race day.
Ideas for Supporting Images
Consider these image concepts for visual support:
- Runner reaching for fuel: Photo of a runner on an open road or trail reaching into a pocket or vest for a gel sachet, ideally at dawn or early morning light
- Fuel options flat lay: Close-up arrangement of different fuel types on a wooden surface—gels, chews, cut bananas, small boiled potatoes with salt, dried fruit, and a sports drink bottle
- Timeline infographic: Simple graphic showing a 2-hour long run with icons at 30, 60, and 90 minutes indicating when to consume gel, chews, or banana
- Trail runner with supplies: Scenic shot of a trail runner at an overlook holding a reusable pouch or small bag of real food
- Gut training progression: Diagram showing gradually increasing carb intake per hour over several weeks of training
Images should appear natural, non-branded, and inclusive—featuring varied body types, genders, and ages. Any infographics should use clear labels like “30–60g carbs/hour” and “every 20–30 minutes” to reinforce key guidelines.
