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CLINICAL KNOWLEDGE MAGAZINE
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Glycemic optimization through low-glycemic-index foods in the nutritional strategy of endurance athletes
David Janitzek
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Diets Premium Medical Expert • 24.09.2026
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Scientifically reviewed by a clinical dietitian:
This article has been peer-reviewed for adherence to IŻŻ, WHO, and PTGiP clinical nutritional standards.
| CLINICAL KNOWLEDGE MAGAZINE CLINICAL KNOWLEDGE MAGAZINE | min read 6 min |
| Diets Premium Medical Expert David Janitzek | Scientifically reviewed by a clinical dietitian 24.09.2026 |
Key Takeaways
The nutritional framework for athletes engaged in endurance disciplines incorporates a range of foundational components whose comprehension facilitates effective metabolic regulation. Among these, the glycemic index of consumed foods emerges as a pivotal factor, playing a critical role in blood glucose modulation, the optimization of the body’s energy resource utilization, and the enhancement of athletic performance outcomes. Its judicious application enables precise tailoring of dietary intake to individual physiological demands, thereby fostering improvements in endurance capacity and post-exertion recovery efficiency.
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Glycemic index and endurance sports
The glycemic index is measured by the concentration and speed at which sugars are released into the blood after a meal. However, low-index products release carbohydrates for a long time, whereas high-weight products provide a rapid boost in blood sugar levels, which is particularly useful before intense exercise. In endurance sports such as running, triathlon, cycling, biking, particular attention should be paid to the consumption of adequate glucose levels. They are important because they are not related to the supply of energy and are the main source of energy, and therefore they have a significant effect on the recovery of weight after exercise.
Glycemic index and glycemic load
Speaking of IG (glycemic index), it is worth mentioning LG, or glycemic load. It is calculated in a simple pattern by multiplying the amount of carbohydrates per 100 g by the product IG and dividing the result by 100. LG is a slightly broader concept than IG. It allows you to assess the content and quality of carbs in the products you eat. Some foods contain very small amounts of carb in 100 g of the product. However, a simple example can be garlic, which in 100 grams contains only 4 to 5 grams of carb at a very high glycological index, or a product with a very low glycologic index, which can be produced as a result of a higher glycogen content.
Glycemic index and training disputes
Now that we know what the glycemic index is, and we know the principles of its relationship with the glucose load, it's enough to know that eating at home is going to be very high in carbohydrates, and so eating at the same time is also very important. However, it is also important to juggle your body's intake of IG products and foods for the purpose and needs of your body.
David Janitzek
Diets Premium Medical Expert
Member of the Diets Premium clinical editorial board. Specializes in medical diet therapy, metabolic health, and nutritional planning.
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