The glycemic load takes into account not only how quickly carbohydrates raise blood sugar levels, but also how many of them are in a serving. It thus supplements the glycemic index with a crucial factor: the actual amount consumed. This makes the glycemic load particularly relevant to everyday life. In this article, you’ll learn how it’s calculated, how it differs from the glycemic index, and what both values mean for your diet.
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What is the glycemic index (GI)?
The glycemic index is a comparative value for carbohydrate-containing foods. It shows how the carbohydrates in a food affect blood sugar levels. Glucose serves as the reference with a value of 100.
A GI of up to 55 is considered low, values between 56 and 69 are considered moderate, and values of 70 or higher are considered high. However, since a fixed amount of carbohydrates is always used for the calculation, the GI says little about a typical serving size. The glycemic load is better suited for this purpose.
What is the glycemic load (GL)?
The glycemic load combines the GI of a food with the amount of digestible carbohydrates in a specific serving. It thus provides an estimate of how strongly the actual amount consumed can affect blood sugar levels.
How is the glycemic load calculated?
The formula is:
GL = GI × digestible carbohydrates per serving in grams ÷ 100
For example, suppose a food has a GI of 60. If a serving contains 20 grams of digestible carbohydrates, the calculation is as follows:
60 × 20 ÷ 100 = 12
The serving therefore has a glycemic load of 12. The values are usually categorized as follows:
- low GL: 10 or less
- medium GL: 11 to 19
- high GL: 20 or more
Why is the GL often more meaningful than the GI?
The GI assesses the quality of the carbohydrates contained in a food but does not take the amount consumed into account. A food with a high GI can still have a low GL if a typical serving contains only a small amount of carbohydrates.
Conversely, a large serving of a food with a moderate GI can result in a high GL. The glycemic load therefore provides a more practical assessment for individual servings. However, the GI and GL should not be considered in isolation: both values complement each other.
What is the difference between the GI and GL?
The most important difference lies in the serving size. While the GI provides a fixed reference value, the GL varies depending on how much you eat.
|
Glycemic Index |
Glycemic Load |
|
| What is being evaluated? | Effects of the carbohydrates it contains | Estimated effect of one serving |
| Is portion size taken into account? | No | Yes |
| What is this value used for? | Comparison of Various Foods | Estimating a Specific Portion |
A simple example illustrates the impact of portion size: With a GI of 60 and 20 grams of digestible carbohydrates, the GL is 12. If you double the portion to 40 grams of carbohydrates, the GL rises to 24, even though the GI remains the same.
The GL is therefore not a fixed value for a food; rather, it always depends on the portion size consumed.
What is the significance of GI and GL in nutrition?
GI and GL can help you better assess carbohydrate-rich foods and meals. However, they are only two of many factors that contribute to a balanced diet.
More Stable Blood Sugar
Meals with a lower glycemic load tend to cause blood sugar levels to rise more slowly or to a lesser extent. This can support a more consistent energy supply throughout the day.
The actual response, however, varies from person to person. Preparation methods, food combinations, physical activity, stress, and individual metabolism also play a role.
Satiety and Cravings
Significant fluctuations in blood sugar levels can lead to cravings in some people. A lower GL can therefore be a helpful guide when planning meals.
However, protein, fat, fiber, and the portion size of the meal are also crucial for long-lasting satiety. For example, combine high-carbohydrate foods with plain yogurt, nuts, seeds, or legumes.
Effects on Weight and Energy
A low glycemic load does not automatically lead to weight loss. Even foods with a low GL can provide many calories if the portion size is large enough.
If you want to lose weight, what matters most is your overall diet and long-term energy balance. GI and GL can help you put together satisfying meals and be more mindful of portion sizes.
Conclusion
The glycemic index indicates how quickly carbohydrates from a food can affect blood sugar levels. The glycemic load also takes into account the amount of carbohydrates in a serving and is therefore often more relevant to everyday eating habits.
Nevertheless, both values serve only as a guide. For a balanced meal, the quality of the foods, portion size, as well as protein, fats, and fiber also matter.
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Frequently Asked Questions
What does it mean if the glycemic load is high?
A high glycemic load of 20 or higher means that a serving is likely to have a stronger effect on blood sugar levels. However, how the body actually reacts also depends on the composition of the meal and the individual’s metabolism.
What is the glycemic load of foods?
The glycemic load combines a food’s glycemic index with the amount of digestible carbohydrates in a serving. This allows for a better assessment of the potential effect on blood sugar levels of an actual amount consumed.
What is the glycemic index, explained simply?
The glycemic index indicates how the carbohydrates in a food affect blood sugar levels. The higher the value, the stronger the blood sugar response compared to glucose.
