Watermelon is one of the lowest in calories only 46 calories per cup. That's lower than even “low-sugar” fruits such as berries. Watermelon contains: Vitamin C, Vitamin A, Vitamins B1, B5 & B6, Potassium, Magnesium, Lycopene, Cucurbitacin E, Citrulline. Benefits of Watermelon: 1)Helps in Hydration. read more