Watermelon is a storage of vitamins: fiber, potassium and vitamins A and C. This green ball is 92% water. That is why it is so nice and easy to gnaw a watermelon in the heat. It is also one of the lowest calories fruits you can eat as much as you like. In the Dominican Republic, watermelons, like melons, are sweeter in summer: in winter, because of the shortened daylight hours, they do not have glucose.