The Glycemic Index of a food is based on a serving containing 50 grams of useable carbohydrate. Glycemic Load attempts to adjust this value to reflect more realistic portion sizes for some foods (for example, watermelon) by multiplying the Glycemic Index by the carbohydrate grams of a typical serving divided by 100.

If the Glycemic Load calculation adjusts for portion sizes and the Glycemic Index is based on a 50 gram standard, shouldn't the Glycemic Load calculation divide by 50 instead of 100? If a particular food happens to have a standard serving size that's close to the 50 gram GI (Glycemic Index) standard, then the Glycemic Load and Glycemic Index of that food should be about the same. However, if you divide by 100 instead of 50, the Glycemic Load value is cut in half, which doesn't make sense.

Am I missing something? I'd appreciate any GI experts out there.

rb