Carb Loading Before Runs

What is Carb Loading?

Carb loading, also known as carbohydrate loading, is a strategy used by endurance athletes to increase the amount of glycogen stored in their muscles before an event. Glycogen is a form of glucose that is stored in the muscles and used as energy during physical activity. By increasing glycogen stores, athletes aim to improve their endurance and delay fatigue during long-distance events such as marathons, triathlons, and ultramarathons.

How Does Carb Loading Work?

The basic principle behind carb loading is to deplete glycogen stores through intense exercise, followed by a period of increased carbohydrate intake to replenish glycogen stores. This process can be achieved through a variety of methods, including tapering, periodization, and modified high-carbohydrate diets.

Tapering involves reducing the intensity and volume of training in the week leading up to the event. This allows the body to recover and rest, while also depleting glycogen stores. Periodization involves alternating periods of high and low carbohydrate intake over the course of several weeks or months, with the aim of manipulating glycogen stores. Modified high-carbohydrate diets involve increasing carbohydrate intake while decreasing protein and fat intake in the days leading up to the event.

Benefits of Carb Loading

Carb loading has been shown to improve endurance and delay fatigue during long-distance events. This is because the body is able to access stored glycogen for energy instead of relying on the breakdown of fats and proteins. In addition, carb loading can also help prevent muscle damage and improve recovery post-exercise.

Who Can Benefit from Carb Loading?

Carb loading is most commonly used by endurance athletes such as runners, swimmers, and cyclists, but it can also be beneficial for other athletes participating in events lasting more than 90 minutes. However, it is important to note that carb loading is not necessary for all athletes and may not provide any additional benefits for those participating in shorter events.

Carb Loading Considerations

While carb loading can be an effective strategy for endurance athletes, it is important to keep in mind that it is not a one-size-fits-all approach and may not work for everyone. Factors such as the intensity and duration of the event, training history, and individual differences in metabolism should be considered when determining the best carb loading strategy.

It is also important to pay attention to the quality of the carbohydrates consumed during carb loading. Complex carbohydrates such as whole grains, fruits, and vegetables are generally more nutrient-dense and provide a sustained energy source compared to simple carbohydrates found in sugary foods and drinks.

In addition, it is important to properly time carbohydrate intake. Consuming carbohydrates too close to the event can lead to gastrointestinal discomfort, while waiting too long may not allow enough time for glycogen stores to be fully replenished.


Carb loading is a popular strategy used by endurance athletes to increase glycogen stores and improve endurance during long-distance events. While it can be effective, it is important to consider individual needs and preferences, as well as the quality and timing of carbohydrate intake. With proper planning and execution, carb loading can be a useful tool for optimizing performance and improving endurance.

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