The significance of managing diabetes is widely recognised in Indian households, often influencing discussions around meal choices. The glycaemic index (GI) has been a traditional measure to evaluate how carbohydrate-rich foods affect blood sugar levels. However, many have found it perplexing as healthy options can still lead to elevated sugar levels. Glycaemic load (GL) is emerging as a more practical tool for assessing the impact of foods on blood glucose and insulin responses.

Glycaemic index indicates how quickly a carbohydrate food raises blood sugar, using a scale of 0 to 100 in comparison to pure glucose. Nevertheless, it does not provide insight into the quantity of carbohydrates consumed. Conversely, glycaemic load takes into account both the speed at which food raises blood sugar and the carbohydrate content in a typical serving, offering a more comprehensive view of its effect.

Dr. Bhavya Arora, a clinical nutritionist from C-Doc Hospital, detailed the calculation of glycaemic load: it is determined by multiplying glycaemic index with the available carbohydrates in a food serving and dividing by 100. Foods are classified as low when the GL is 10 or less, medium when it is between 11 to 19, and high when it exceeds 20.

Comparative Analysis of Foods

Dr. Mohan provided an illustrative example regarding watermelon, which has a high GI of approximately 72 to 80. Despite its rapid sugar absorption due to high water content, a typical serving of watermelon contains minimal carbohydrates. Consequently, its glycaemic load is relatively low at around 5. This suggests that the impact on blood sugar is manageable when consumed in moderation.

In contrast, white rice presents a different scenario. While it boasts a moderate GI of 70 to 75, a typical serving often contains significant quantities. Dr. Arora explained that 100 grams of cooked white rice comprises about 28 grams of carbohydrates. This calculation leads to a glycaemic load of 21, categorising it as high, indicating a more detrimental gradual rise in blood sugar levels.

The contrasting effects of these foods illustrate the importance of glycaemic load. While watermelon may appear unfavourable due to its GI, its actual blood sugar impact is less significant than that of white rice when portion sizes are accounted for. This distinction aids individuals in making informed dietary choices.

The Implications for Diabetes Management

Glycaemic load offers a realistic assessment of how various foods influence blood glucose levels, revealing that some foods have low carbohydrate content per serving despite a high glycaemic index. Dr. Mohan highlighted examples such as watermelon and pumpkin, which, despite their high GI, have low GL due to their water-rich composition.

Conversely, it is important to note that certain foods may showcase a low glycaemic index yet possess a high glycaemic load when consumed in large amounts, owing to their carbohydrate density. Brown rice serves as an example; despite having a medium glycaemic index, its glycaemic load can be significant if consumed excessively.

For individuals managing diabetes, understanding both glycaemic index and glycaemic load is essential. Nevertheless, Dr. Mohan emphasised that glycaemic load tends to be more beneficial for meal planning as it reflects real eating patterns. A balanced approach is to favour low GI foods, monitor portion sizes to maintain low GL, and combine carbohydrates with proteins and healthy fats to mitigate blood sugar spikes.

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