Watermelon has a significant amount of natural sugar as opposed to refined sugar which is what you want to avoid as much as possible. Natural sugar is good for the body and necessary in order for it to function properly. Diabetics can feel free to eat watermelon because of the fact that there is only natural sugar in it.
Although it is natural sugar, diabetics should still test their blood glucose level every couple hours when eating it, just to make sure there are no adverse reactions. Those who have a glucose level that is up by more than 50 points will want to cut down on eating this food as it could cause certain health complications.