Cantaloupes are an excellent source of both Vitamin A and Vitamin C. A six-ounce serving, or roughly a quarter of a melon, provides 100 percent, or more, of the U.S. recommended daily allowances of each vitamin. Cantaloupes are also high in dietary fiber as well as folacin; a nutrient needed for growth and the development of hemoglobin. All of the nutrition in cantaloupes comes with minimal calories. There are 60 calories in a six-ounce serving of cantaloupe. Cantaloupes contain no fat or cholesterol.