Energy Gels vs Real Food: How Endurance Athletes Fuel Training

Reviewed by Roxanne Vogel, PhD

Endurance athletes often ask a simple question when planning their fueling strategy.

Should you use energy gels or real food during training?

In reality, most athletes rely on both. Real food helps support everyday nutrition and pre workout meals. Performance fuel like GU Energy products helps deliver fast carbohydrates during exercise, when energy needs to be predictable and easy to digest.

Understanding how each fits into your training can help you maintain steady energy during long runs, rides, and races.

Why Fueling During Exercise Matters

During endurance activity, the body relies heavily on carbohydrates for energy. These carbohydrates are stored as glycogen in the muscles and liver.

As exercise continues, glycogen stores begin to drop. Without consistent fueling, athletes may experience fatigue, reduced performance, or the feeling runners call "hitting the wall."

That is why many endurance athletes aim to consume 30 to 60 grams of carbohydrates per hour during longer workouts.

The challenge is delivering those carbohydrates in a way that is easy to digest and easy to carry while moving.

When Real Food Works Best

Real food plays an important role in an athlete’s overall nutrition. Foods like bananas, oatmeal, rice, toast, or dates provide carbohydrates along with vitamins and minerals that support daily training and recovery.

Real food is commonly used for:

Before workouts
Meals eaten one to three hours before activity help top off liver glycogen stores and raise blood glucose levels in preparation for exercise.

Post workout recovery
Balanced meals with carbohydrates and protein help replenish glycogen stores and support muscle repair.

Very long, lower intensity efforts
Some athletes use small amounts of real foods during ultramarathons or long cycling days and stage races.

However, real food is not always ideal during intense exercise. Fiber, fat, and protein can slow digestion and sometimes cause stomach discomfort while running or riding. This is where specialized sports nutrition becomes useful.

Why Energy Gels Are Designed for Exercise

Energy gels are designed specifically for endurance athletes who need quick, easily digestible carbohydrates during activity.

GU Energy products provide concentrated carbohydrates along with electrolytes and amino acids to support sustained performance.

Because gels are lightweight, portable, and easy to consume, they help athletes maintain consistent fueling without slowing them down.

When to Take GU Energy Gels

A common fueling strategy recommended for GU Energy Gels is:

• Take 1 gel about 5 minutes before starting exercise
• Take 1 gel every 20 to 30 minutes during activity

Each serving delivers roughly 21 to 23 grams of carbohydrates, helping athletes maintain steady energy levels throughout long workouts.

Different Types of GU Energy Gels

GU offers several types of energy gels designed for different training needs and athlete preferences.

Original GU Energy Gels

Original GU Energy Gels are the classic endurance fuel many athletes rely on.

They provide fast absorbing carbohydrates along with electrolytes and amino acids to support sustained energy during activity.

These gels are commonly used for:

• Long runs
• Cycling workouts
• Races
• General endurance training

GU Liquid Energy

GU Liquid Energy provides the same fast carbohydrates as traditional gels, but in a lighter, more fluid texture.

Some athletes prefer this format because it can feel easier to consume during intense efforts.

Liquid Energy is often used for:

• High intensity workouts
• Athletes who prefer a smoother texture
• Quick fueling during races

GU Roctane Energy Gels

For longer or more demanding efforts, athletes often turn to GU Roctane Energy Gels.

Roctane gels are designed for higher intensity and longer duration training, providing additional electrolytes and amino acids compared with standard gels.

They are commonly used during:

• Marathons and ultramarathons
• Long cycling events
• Ironman and triathlon racing
• Extended or high intensity endurance sessions

How Real Food and Energy Gels Work Together

Instead of choosing between real food and sports nutrition, most athletes combine them.

Each plays a different role in supporting endurance performance. A common fueling approach might look like this:

Before training
Eat a carbohydrate focused meal such as oatmeal, toast, or fruit.

5 minutes before exercise
Take 1 GU Energy Gel.

During long workouts
Take 1 GU Energy Gel every 20 to 30 minutes to maintain steady carbohydrate intake.

After training
Focus on recovery with balanced meals that include carbohydrates and protein.

Why GU Energy Products Are Essential for Endurance Fueling

Real food helps support daily nutrition and pre workout fueling.

GU Energy products are designed to deliver fast, convenient carbohydrates during exercise, when athletes need energy that is easy to digest and simple to carry.

By combining real food with GU Energy Gels, Liquid Energy, or Roctane Energy Gels, athletes can maintain steady energy throughout long runs, rides, and races.

This approach allows endurance athletes to fuel consistently, avoid energy crashes, and stay strong during demanding training sessions.