If you're a diabetic, you do have to be careful of certain fruits (I learned that years ago when I first was diagnosed as being a diabetic) and once you learn by trial and error which fruits affect you worse for raising blood-sugar readings, you go from there.
Watermelon was killer, same with strawberries. (My own personal study)
Now, what I do is stop at a Mexican fruit vendor and get a mixed bowl with 3 different kinds of melon, a little pineapple, mango and orange with lime juice and a little chili powder. Very satisfying dessert.