I just researched the glycemic load information. Interesting. Basically it defines that small portion of a food with a high glycemic level will affect the blood sugar in the same way that a normal to large portion of a food with a low glycemic level.
Watermelon, besides being high in lycopene, is relatively low in nutritional value otherwise. As much as I like it, I can definitely go without it all the time because it does cause me to spike and crash. Maintaining an even blood sugar level has done wonders for my mental stability ... and my marriage
With that information, you must also remember that it says a
small amount of a high GI food is the same as a normal/large amount of a low GI food. Just because watermelon has a low GL, doesn't mean that we can eat as much as we want just because it isn't as high as say, white bread. It might not be high calorie wise, but it is high on the glycemic level, and the more that you eat, the more it will affect the blood sugar.