Energy Gels for Distance Running

For runners tackling long distances, maintaining energy levels is a key challenge. This is where energy gels for running come into play. These portable packets of concentrated carbohydrates are a popular tool for mid-run fueling, helping to delay fatigue and maintain pace during half marathons, marathons, and long training runs. But using them effectively requires understanding what they contain, how much you need, and when to take them. This guide will walk you through the basics of using running gels as part of a smart fueling strategy.

What Do Energy Gels Contain?

At their core, energy gels are designed to deliver a quick and easily digestible source of carbohydrates. While formulations vary, most contain a mix of the following key ingredients:

• Carbohydrates: This is the primary fuel. Gels typically use sugars like glucose, fructose, and maltodextrin. Some gels use a blend of multiple carbohydrate sources, which research suggests can increase the rate of absorption and reduce gastrointestinal distress compared to a single source.
• Electrolytes: Many gels include sodium, potassium, and sometimes magnesium to help replace what’s lost in sweat. This is crucial for maintaining nerve function and fluid balance, especially in hot conditions or during very long events.
• Caffeine: Some gels include caffeine, a stimulant that can enhance alertness, reduce perceived effort, and may help mobilize fat stores for fuel. It’s important to test your tolerance to caffeinated gels in training, as they can cause jitters or stomach upset in some individuals.
• Amino Acids: A few specialized gels may include branched-chain amino acids (BCAAs) with the aim of reducing muscle damage, though the performance benefit for mid-run fueling is less clear than that of carbohydrates.
• Water: Gels have a thick, syrupy consistency but do contain some water. However, they are concentrated and must be consumed with plain water for proper digestion and to avoid drawing water into your gut, which can cause cramps.

How Much Carbohydrate Do You Need Per Hour?

The amount of carbohydrate you should aim to consume during a long run is based on exercise duration and intensity. General guidance from sports nutrition research and bodies like the American College of Sports Medicine (ACSM) provides a target range.

To put this into practice, if you are aiming for 45 grams of carbohydrate per hour during a marathon, and your gel of choice contains 22 grams, you would plan to take roughly two gels per hour. It’s essential to check the nutrition label on your specific gel to do this math accurately. Your needs will vary based on your size, pace, and the conditions, so this is a starting point for your marathon nutrition plan.

Timing Your Gels and the Critical Role of Water

When you take your gels is just as important as how many you take. A common strategy is to take your first gel shortly before you start to feel fatigued, typically around 45-60 minutes into your run, and then continue at regular intervals.

Water is non-negotiable. Drinking a sports drink with a gel can lead to an overly concentrated carbohydrate solution in your stomach, which is a common cause of gastrointestinal problems. For more on balancing fluids, see our guide on hydration during long runs.

Avoiding GI Distress: Practice in Training

Gastrointestinal (GI) distress—cramping, nausea, bloating—is the most common issue runners face with energy gels. The best way to prevent race-day problems is systematic practice during your training cycle.

1. Start with a Familiar Stomach: Never try a new gel, or any new fuel, on race day. Test different brands and flavors during your easier or long training runs.
2. Simulate Race Conditions: Practice your fueling at your goal race pace and, if possible, in similar weather conditions. Heat can significantly impact how your stomach handles fuel.
3. Find Your Personal Limit: Gradually increase your carbohydrate intake during runs to find the maximum amount per hour your stomach can comfortably tolerate.
4. Listen to Your Body: If a particular gel consistently causes issues, try another formulation. Gels with multiple carbohydrate transport pathways (e.g., glucose-fructose blends) are often better tolerated.

Alternatives to Energy Gels

While running gels are convenient, they aren’t the only option for mid-run fuel. Some runners prefer whole foods or other products, especially for very long distances where taste fatigue can set in. Alternatives include:

• Sports Drinks: Provide carbohydrates and electrolytes in a diluted liquid form, which can simplify hydration and fueling into one step.
• Chews/Bloks: Similar carbohydrate content to gels but in a chewable form. They also require water for digestion.
• Real Food: For ultramarathons or long training runs, foods like bananas, dates, pretzels, or small sandwiches can be appealing and effective.
• Homemade Options: Some runners make their own fuel mixes using ingredients like maple syrup, fruit purees, or honey.

The best choice is the one that works reliably for your stomach and you can consistently consume. Your overall running nutrition basics should support your training, with mid-run fuel being one component.

Frequently Asked Questions

How many gels for a marathon?

This depends on your hourly carbohydrate target and the carbohydrate content of your gel. A typical plan might look like this: If you aim for 45 grams per hour, use a gel with 22 grams, and run a 4-hour marathon, you would need about 180 grams of carbohydrate in total, or roughly one 22-gram gel every 30 minutes (about 8 gels) once you start fueling. Always test this exact plan in your long runs. Use our running tools to help calculate your pacing and fueling intervals.

When is the best time to take gels in a marathon?

Start early, before you feel tired. A common and effective strategy is to take your first gel about 45 minutes into the race, and then another every 30-45 minutes thereafter. Time your intake to coincide with water stations so you can drink the necessary water immediately.

Can I take gels with sports drink instead of water?

It’s not recommended. Combining a gel (high carb concentration) with a sports drink (also high carb concentration) can create an overly sugary solution in your stomach, slowing absorption and increasing the risk of cramps, bloating, and diarrhea. Use plain water with your gels.

What should I do if a gel makes me feel sick?

First, ensure you are drinking enough water with it. If nausea persists, try a different brand or formulation in your next training run. Some runners tolerate gels with different sugar blends or without caffeine better. If GI issues are a consistent problem, consider consulting a sports dietitian.

Do I need energy gels for a half marathon?

For many runners, taking one gel during a half marathon can be beneficial, especially if you’re running for over 90 minutes. Taking one around the 45-60 minute mark can help maintain energy levels through the final miles. As always, practice this in training first.