January 1, 2020/Exercise & Fitness

Energy Gels: How They Can Help You Fuel a Long Workout

Expert advice to help you get the most from your training time

Packets of energy gels in marathon kit

If you’re a long-distance runner, cyclist or any kind of endurance athlete, you may have heard about energy gels or have considered adding them to your nutrition strategy.


Cleveland Clinic is a non-profit academic medical center. Advertising on our site helps support our mission. We do not endorse non-Cleveland Clinic products or services. Policy

But what are these products and what’s the best way to use them? Dietitian Katherine Patton, MEd, RD, CSSD, LD explains.

Q: What are energy gels?

A: Energy gels are carbohydrate-rich gels that provide energy for exercise. They’re for use by adults and are made from a blend of sugars, most often maltodextrin and fructose.

Most energy gels come in 1-ounce or 1.5-ounce packets, which makes them convenient to consume during a long-distance event. Most energy gels have no fat, fiber or protein – so your body digests them quickly.

Q: Why use energy gels?

A: Runners, swimmers, cyclists or anyone who exercises for more than 60 minutes needs to adequately fuel their body for the best workout. This is important because while you exercise, your body draws on carbohydrates stored in your muscles. However, the available amount is limited.

Research shows consuming carbohydrates during exercise that lasts longer than an hour improves metabolic response and athletic performance and prevents glycogen depletion.


The American College of Sports Medicine recommends consuming 30 grams to 60 grams of carbohydrates per hour of exercise. Most energy gels pack 23 grams to 27 grams of carbohydrates while an 8-ounce sports drink only provides 14 grams of carbohydrates.

Energy gels are simple to consume, not filling and easily digestible. Using gels can help you maintain your energy level and prevent fatigue during intense or prolonged periods of exercise.

Q: What precautions do I need to take with energy gels?

A: Energy gels contain a concentrated amount of sugar, so taking them too quickly could cause an upset stomach. To prevent this, wash down your energy gel with sips of water.

Though energy gels provide needed fuel, remember that what works for one athlete might not work for another. Each runner absorbs and processes carbohydrates at a different rate. One person might feel the effect within three minutes, while others might take up to 15 minutes.

Also keep in mind that if you’re an endurance athlete training for competition, you need to devise a fueling strategy and incorporate it into your training regimen before race day.


So eat gels while you’re training and consume them at intervals similar to your plans for the race. Your body will learn to keep the digestive track active while you’re running and you’ll digest the gels more readily.

Plan a fueling strategy and practice it during long training sessions to determine what works best for you. Good training, proper fueling and adequate hydration provides the foundation for achieving your personal best.

Learn more about our editorial process.

Related Articles

Person on scale, questioning muscle weight vs. fat weight
April 12, 2024/Exercise & Fitness
The Difference Between Muscle Weight vs. Fat Weight

Both are needed for a healthy body

Person in office doing leg lifts
April 10, 2024/Exercise & Fitness
5 Psoas Stretches and Exercises

Counteract psoas muscle stiffness and soreness with stretches that lengthen and strengthen

Muscular person using weight machine in gym, headphones around neck
April 8, 2024/Exercise & Fitness
Is It Bad To Do the Same Workout Every Day?

It may be OK, depending on your health, fitness level and type of exercise

Person stretching neck at work desk in front of monitor
April 5, 2024/Exercise & Fitness
8 Posture Exercises To Sit and Stand Straighter

Simple exercises like wall angels and pelvic tilts can help keep your body in an optimal position — and help undo years of improper posture habits

female sitting meditating, eyes closed
March 19, 2024/Weight Loss
14 Ways To Lose Belly Fat

Losing belly fat can reduce your risk for chronic health conditions — try focusing on a diet high in lean protein, exercising regularly, reducing stress and getting quality ZZZs

person running with food and fitness images floating behind
March 6, 2024/Exercise & Fitness
Is It Safe to Work Out While You’re Fasting?

It’s best to exercise before or after your fast, instead of during it

Older couple talk while leisurely walk across a bridge
February 29, 2024/Heart Health
Can You Exercise After a Heart Attack?

Absolutely! In fact, in many ways, exercise is key to recovery

Person in bikini at beach with hip area accented showing hip dips
February 22, 2024/Exercise & Fitness
Your ‘Hip Dips’ Are Normal — And They Aren’t Going Anywhere Anytime Soon

Your bone structure determines whether you have a visible dent between your hips and your thighs

Trending Topics

Person in yellow tshirt and blue jeans relaxing on green couch in living room reading texts on their phone.
Here’s How Many Calories You Naturally Burn in a Day

Your metabolism may torch 1,300 to 2,000 calories daily with no activity

woman snacking on raisins and nuts
52 Foods High In Iron

Pump up your iron intake with foods like tuna, tofu and turkey