What are the benefits of having melons casaba during pregnancy? Melons Casaba are low on calories and a good source of vital nutrients. They are also rich in potassium, a nutrient that helps keep your blood pressure in control. Casaba also has vitamin B complex including vitamins B1, B3, B5, and B6. According to the American Pregnancy Association, vitamin B3 also known as niacin, helps improve digestion, reduces nausea and takes the edge of debilitating migranes. Hence, melons casaba is a good addition to your pregnancy diet.