One-eighth of a medium-sized cantaloupe contains 23 calories, 6 grams of carbohydrate and about half of the daily requirements for vitamins A and vitamin C. Cantaloupe is a good source of potassium and also contains small amounts of several B vitamins, vitamin K and magnesium.
Five of the 6 carbohydrate grams in a serving of cantaloupe come from sugar; the other gram is fiber. The sugar gives it a glycemic load of two, which diabetics and others watching their blood sugar levels may need to take into account when considering portion size.
Vitamin A is important for the health of the eyes and vision. It also has a role in cell growth. Vitamin C helps the body form collagen, a connective tissue. Potassium aids in maintaining a healthy blood pressure.