Glycemic load (GL)
GI adjusted for the carbohydrate in a real serving: a better guide to a food's actual impact.
Glycemic load multiplies a food's glycemic index by the grams of carbohydrate in your serving, divided by 100. It answers the practical question GI alone can't: how much will this portion move my glucose?
Watermelon is the classic example: high GI, but so little carbohydrate per serving that its glycemic load is low. A load of 10 or under is low, 11–19 medium, and 20 or more high.